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annotate Lib/argparse.py @ 72181:c1949bde461e

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Minor improvement to extensions in setup.cfg: check parent package
author Éric Araujo <merwok@netwok.org>
date Thu, 01 Sep 2011 07:01:13 +0200
parents cab204a79e09
children 83f43b58c988
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1 # Author: Steven J. Bethard <steven.bethard@gmail.com>.
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2
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3 """Command-line parsing library
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4
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5 This module is an optparse-inspired command-line parsing library that:
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6
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7 - handles both optional and positional arguments
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8 - produces highly informative usage messages
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9 - supports parsers that dispatch to sub-parsers
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10
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11 The following is a simple usage example that sums integers from the
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12 command-line and writes the result to a file::
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13
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14 parser = argparse.ArgumentParser(
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15 description='sum the integers at the command line')
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16 parser.add_argument(
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17 'integers', metavar='int', nargs='+', type=int,
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18 help='an integer to be summed')
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19 parser.add_argument(
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20 '--log', default=sys.stdout, type=argparse.FileType('w'),
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21 help='the file where the sum should be written')
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22 args = parser.parse_args()
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23 args.log.write('%s' % sum(args.integers))
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24 args.log.close()
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25
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26 The module contains the following public classes:
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27
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28 - ArgumentParser -- The main entry point for command-line parsing. As the
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29 example above shows, the add_argument() method is used to populate
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30 the parser with actions for optional and positional arguments. Then
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31 the parse_args() method is invoked to convert the args at the
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32 command-line into an object with attributes.
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33
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34 - ArgumentError -- The exception raised by ArgumentParser objects when
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35 there are errors with the parser's actions. Errors raised while
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36 parsing the command-line are caught by ArgumentParser and emitted
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37 as command-line messages.
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38
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39 - FileType -- A factory for defining types of files to be created. As the
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40 example above shows, instances of FileType are typically passed as
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41 the type= argument of add_argument() calls.
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42
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43 - Action -- The base class for parser actions. Typically actions are
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44 selected by passing strings like 'store_true' or 'append_const' to
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45 the action= argument of add_argument(). However, for greater
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46 customization of ArgumentParser actions, subclasses of Action may
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47 be defined and passed as the action= argument.
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48
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49 - HelpFormatter, RawDescriptionHelpFormatter, RawTextHelpFormatter,
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50 ArgumentDefaultsHelpFormatter -- Formatter classes which
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51 may be passed as the formatter_class= argument to the
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52 ArgumentParser constructor. HelpFormatter is the default,
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53 RawDescriptionHelpFormatter and RawTextHelpFormatter tell the parser
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54 not to change the formatting for help text, and
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55 ArgumentDefaultsHelpFormatter adds information about argument defaults
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56 to the help.
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57
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58 All other classes in this module are considered implementation details.
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59 (Also note that HelpFormatter and RawDescriptionHelpFormatter are only
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60 considered public as object names -- the API of the formatter objects is
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61 still considered an implementation detail.)
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62 """
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63
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64 __version__ = '1.1'
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65 __all__ = [
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66 'ArgumentParser',
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67 'ArgumentError',
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68 'ArgumentTypeError',
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69 'FileType',
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70 'HelpFormatter',
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71 'ArgumentDefaultsHelpFormatter',
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72 'RawDescriptionHelpFormatter',
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73 'RawTextHelpFormatter',
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74 'MetavarTypeHelpFormatter',
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75 'Namespace',
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76 'Action',
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77 'ONE_OR_MORE',
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78 'OPTIONAL',
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79 'PARSER',
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80 'REMAINDER',
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81 'SUPPRESS',
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82 'ZERO_OR_MORE',
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83 ]
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84
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85
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74f9ed48ae5d Issue #9026: Fix order of argparse sub-commands in help messages.
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86 import collections as _collections
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87 import copy as _copy
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88 import os as _os
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89 import re as _re
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90 import sys as _sys
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91 import textwrap as _textwrap
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92
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1827a8ac9b18 Use proper plural forms in argparse (#4391)
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93 from gettext import gettext as _, ngettext
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94
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95
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96 def _callable(obj):
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97 return hasattr(obj, '__call__') or hasattr(obj, '__bases__')
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98
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99
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100 SUPPRESS = '==SUPPRESS=='
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101
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102 OPTIONAL = '?'
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103 ZERO_OR_MORE = '*'
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104 ONE_OR_MORE = '+'
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105 PARSER = 'A...'
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106 REMAINDER = '...'
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107 _UNRECOGNIZED_ARGS_ATTR = '_unrecognized_args'
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108
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109 # =============================
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110 # Utility functions and classes
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111 # =============================
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112
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113 class _AttributeHolder(object):
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114 """Abstract base class that provides __repr__.
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115
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116 The __repr__ method returns a string in the format::
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117 ClassName(attr=name, attr=name, ...)
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118 The attributes are determined either by a class-level attribute,
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119 '_kwarg_names', or by inspecting the instance __dict__.
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120 """
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121
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122 def __repr__(self):
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123 type_name = type(self).__name__
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124 arg_strings = []
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125 for arg in self._get_args():
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126 arg_strings.append(repr(arg))
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127 for name, value in self._get_kwargs():
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128 arg_strings.append('%s=%r' % (name, value))
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129 return '%s(%s)' % (type_name, ', '.join(arg_strings))
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130
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131 def _get_kwargs(self):
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132 return sorted(self.__dict__.items())
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133
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134 def _get_args(self):
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135 return []
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136
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137
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138 def _ensure_value(namespace, name, value):
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139 if getattr(namespace, name, None) is None:
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140 setattr(namespace, name, value)
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141 return getattr(namespace, name)
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142
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143
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144 # ===============
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145 # Formatting Help
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146 # ===============
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147
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148 class HelpFormatter(object):
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149 """Formatter for generating usage messages and argument help strings.
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150
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151 Only the name of this class is considered a public API. All the methods
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152 provided by the class are considered an implementation detail.
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153 """
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154
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155 def __init__(self,
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156 prog,
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157 indent_increment=2,
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158 max_help_position=24,
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159 width=None):
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160
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161 # default setting for width
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162 if width is None:
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163 try:
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164 width = int(_os.environ['COLUMNS'])
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165 except (KeyError, ValueError):
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166 width = 80
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167 width -= 2
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168
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169 self._prog = prog
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170 self._indent_increment = indent_increment
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171 self._max_help_position = max_help_position
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172 self._width = width
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173
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174 self._current_indent = 0
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175 self._level = 0
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176 self._action_max_length = 0
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177
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178 self._root_section = self._Section(self, None)
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179 self._current_section = self._root_section
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180
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181 self._whitespace_matcher = _re.compile(r'\s+')
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182 self._long_break_matcher = _re.compile(r'\n\n\n+')
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183
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184 # ===============================
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185 # Section and indentation methods
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186 # ===============================
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187 def _indent(self):
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188 self._current_indent += self._indent_increment
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189 self._level += 1
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190
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191 def _dedent(self):
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192 self._current_indent -= self._indent_increment
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193 assert self._current_indent >= 0, 'Indent decreased below 0.'
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194 self._level -= 1
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195
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196 class _Section(object):
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197
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198 def __init__(self, formatter, parent, heading=None):
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199 self.formatter = formatter
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200 self.parent = parent
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201 self.heading = heading
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202 self.items = []
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203
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204 def format_help(self):
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205 # format the indented section
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206 if self.parent is not None:
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207 self.formatter._indent()
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208 join = self.formatter._join_parts
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209 for func, args in self.items:
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210 func(*args)
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211 item_help = join([func(*args) for func, args in self.items])
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212 if self.parent is not None:
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213 self.formatter._dedent()
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214
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215 # return nothing if the section was empty
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216 if not item_help:
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217 return ''
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218
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219 # add the heading if the section was non-empty
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220 if self.heading is not SUPPRESS and self.heading is not None:
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221 current_indent = self.formatter._current_indent
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222 heading = '%*s%s:\n' % (current_indent, '', self.heading)
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223 else:
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224 heading = ''
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225
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226 # join the section-initial newline, the heading and the help
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227 return join(['\n', heading, item_help, '\n'])
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228
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229 def _add_item(self, func, args):
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230 self._current_section.items.append((func, args))
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231
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232 # ========================
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233 # Message building methods
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234 # ========================
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235 def start_section(self, heading):
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236 self._indent()
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237 section = self._Section(self, self._current_section, heading)
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238 self._add_item(section.format_help, [])
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239 self._current_section = section
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240
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241 def end_section(self):
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242 self._current_section = self._current_section.parent
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243 self._dedent()
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244
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245 def add_text(self, text):
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246 if text is not SUPPRESS and text is not None:
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247 self._add_item(self._format_text, [text])
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248
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249 def add_usage(self, usage, actions, groups, prefix=None):
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250 if usage is not SUPPRESS:
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251 args = usage, actions, groups, prefix
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252 self._add_item(self._format_usage, args)
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253
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254 def add_argument(self, action):
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255 if action.help is not SUPPRESS:
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256
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257 # find all invocations
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258 get_invocation = self._format_action_invocation
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259 invocations = [get_invocation(action)]
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260 for subaction in self._iter_indented_subactions(action):
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261 invocations.append(get_invocation(subaction))
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262
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263 # update the maximum item length
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264 invocation_length = max([len(s) for s in invocations])
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265 action_length = invocation_length + self._current_indent
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266 self._action_max_length = max(self._action_max_length,
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267 action_length)
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268
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269 # add the item to the list
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270 self._add_item(self._format_action, [action])
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271
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272 def add_arguments(self, actions):
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273 for action in actions:
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274 self.add_argument(action)
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275
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276 # =======================
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277 # Help-formatting methods
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278 # =======================
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279 def format_help(self):
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280 help = self._root_section.format_help()
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281 if help:
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282 help = self._long_break_matcher.sub('\n\n', help)
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283 help = help.strip('\n') + '\n'
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284 return help
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285
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286 def _join_parts(self, part_strings):
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287 return ''.join([part
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288 for part in part_strings
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289 if part and part is not SUPPRESS])
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290
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291 def _format_usage(self, usage, actions, groups, prefix):
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292 if prefix is None:
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293 prefix = _('usage: ')
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294
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295 # if usage is specified, use that
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296 if usage is not None:
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297 usage = usage % dict(prog=self._prog)
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298
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299 # if no optionals or positionals are available, usage is just prog
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300 elif usage is None and not actions:
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301 usage = '%(prog)s' % dict(prog=self._prog)
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302
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303 # if optionals and positionals are available, calculate usage
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304 elif usage is None:
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305 prog = '%(prog)s' % dict(prog=self._prog)
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306
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307 # split optionals from positionals
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308 optionals = []
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309 positionals = []
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310 for action in actions:
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311 if action.option_strings:
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312 optionals.append(action)
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313 else:
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314 positionals.append(action)
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315
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316 # build full usage string
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317 format = self._format_actions_usage
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318 action_usage = format(optionals + positionals, groups)
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319 usage = ' '.join([s for s in [prog, action_usage] if s])
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320
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321 # wrap the usage parts if it's too long
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322 text_width = self._width - self._current_indent
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323 if len(prefix) + len(usage) > text_width:
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324
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325 # break usage into wrappable parts
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326 part_regexp = r'\(.*?\)+|\[.*?\]+|\S+'
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327 opt_usage = format(optionals, groups)
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328 pos_usage = format(positionals, groups)
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329 opt_parts = _re.findall(part_regexp, opt_usage)
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330 pos_parts = _re.findall(part_regexp, pos_usage)
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331 assert ' '.join(opt_parts) == opt_usage
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332 assert ' '.join(pos_parts) == pos_usage
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333
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334 # helper for wrapping lines
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335 def get_lines(parts, indent, prefix=None):
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336 lines = []
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337 line = []
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338 if prefix is not None:
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339 line_len = len(prefix) - 1
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340 else:
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341 line_len = len(indent) - 1
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342 for part in parts:
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343 if line_len + 1 + len(part) > text_width:
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344 lines.append(indent + ' '.join(line))
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345 line = []
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346 line_len = len(indent) - 1
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347 line.append(part)
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348 line_len += len(part) + 1
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349 if line:
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350 lines.append(indent + ' '.join(line))
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351 if prefix is not None:
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352 lines[0] = lines[0][len(indent):]
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353 return lines
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354
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355 # if prog is short, follow it with optionals or positionals
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356 if len(prefix) + len(prog) <= 0.75 * text_width:
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357 indent = ' ' * (len(prefix) + len(prog) + 1)
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358 if opt_parts:
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359 lines = get_lines([prog] + opt_parts, indent, prefix)
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360 lines.extend(get_lines(pos_parts, indent))
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361 elif pos_parts:
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362 lines = get_lines([prog] + pos_parts, indent, prefix)
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363 else:
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364 lines = [prog]
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365
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366 # if prog is long, put it on its own line
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367 else:
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368 indent = ' ' * len(prefix)
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369 parts = opt_parts + pos_parts
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370 lines = get_lines(parts, indent)
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371 if len(lines) > 1:
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372 lines = []
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373 lines.extend(get_lines(opt_parts, indent))
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374 lines.extend(get_lines(pos_parts, indent))
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375 lines = [prog] + lines
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376
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377 # join lines into usage
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378 usage = '\n'.join(lines)
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379
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380 # prefix with 'usage:'
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381 return '%s%s\n\n' % (prefix, usage)
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382
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383 def _format_actions_usage(self, actions, groups):
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384 # find group indices and identify actions in groups
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385 group_actions = set()
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386 inserts = {}
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387 for group in groups:
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388 try:
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389 start = actions.index(group._group_actions[0])
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390 except ValueError:
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391 continue
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392 else:
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393 end = start + len(group._group_actions)
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394 if actions[start:end] == group._group_actions:
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395 for action in group._group_actions:
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396 group_actions.add(action)
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397 if not group.required:
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398 if start in inserts:
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399 inserts[start] += ' ['
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400 else:
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401 inserts[start] = '['
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402 inserts[end] = ']'
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403 else:
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404 if start in inserts:
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405 inserts[start] += ' ('
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406 else:
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407 inserts[start] = '('
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408 inserts[end] = ')'
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409 for i in range(start + 1, end):
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410 inserts[i] = '|'
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411
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412 # collect all actions format strings
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413 parts = []
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414 for i, action in enumerate(actions):
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415
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416 # suppressed arguments are marked with None
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417 # remove | separators for suppressed arguments
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418 if action.help is SUPPRESS:
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419 parts.append(None)
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420 if inserts.get(i) == '|':
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421 inserts.pop(i)
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422 elif inserts.get(i + 1) == '|':
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423 inserts.pop(i + 1)
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424
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425 # produce all arg strings
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426 elif not action.option_strings:
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427 default = self._get_default_metavar_for_positional(action)
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428 part = self._format_args(action, default)
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429
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430 # if it's in a group, strip the outer []
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431 if action in group_actions:
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432 if part[0] == '[' and part[-1] == ']':
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433 part = part[1:-1]
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434
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435 # add the action string to the list
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436 parts.append(part)
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437
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438 # produce the first way to invoke the option in brackets
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439 else:
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440 option_string = action.option_strings[0]
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441
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442 # if the Optional doesn't take a value, format is:
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443 # -s or --long
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444 if action.nargs == 0:
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445 part = '%s' % option_string
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446
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447 # if the Optional takes a value, format is:
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448 # -s ARGS or --long ARGS
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449 else:
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450 default = self._get_default_metavar_for_optional(action)
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451 args_string = self._format_args(action, default)
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452 part = '%s %s' % (option_string, args_string)
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453
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454 # make it look optional if it's not required or in a group
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455 if not action.required and action not in group_actions:
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456 part = '[%s]' % part
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457
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458 # add the action string to the list
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459 parts.append(part)
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460
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461 # insert things at the necessary indices
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462 for i in sorted(inserts, reverse=True):
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463 parts[i:i] = [inserts[i]]
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464
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465 # join all the action items with spaces
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466 text = ' '.join([item for item in parts if item is not None])
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467
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468 # clean up separators for mutually exclusive groups
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469 open = r'[\[(]'
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470 close = r'[\])]'
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471 text = _re.sub(r'(%s) ' % open, r'\1', text)
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472 text = _re.sub(r' (%s)' % close, r'\1', text)
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473 text = _re.sub(r'%s *%s' % (open, close), r'', text)
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474 text = _re.sub(r'\(([^|]*)\)', r'\1', text)
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475 text = text.strip()
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476
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477 # return the text
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478 return text
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479
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480 def _format_text(self, text):
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481 if '%(prog)' in text:
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482 text = text % dict(prog=self._prog)
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483 text_width = self._width - self._current_indent
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484 indent = ' ' * self._current_indent
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485 return self._fill_text(text, text_width, indent) + '\n\n'
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486
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487 def _format_action(self, action):
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488 # determine the required width and the entry label
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489 help_position = min(self._action_max_length + 2,
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490 self._max_help_position)
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491 help_width = self._width - help_position
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492 action_width = help_position - self._current_indent - 2
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493 action_header = self._format_action_invocation(action)
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494
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495 # ho nelp; start on same line and add a final newline
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496 if not action.help:
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497 tup = self._current_indent, '', action_header
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498 action_header = '%*s%s\n' % tup
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499
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500 # short action name; start on the same line and pad two spaces
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501 elif len(action_header) <= action_width:
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502 tup = self._current_indent, '', action_width, action_header
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503 action_header = '%*s%-*s ' % tup
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504 indent_first = 0
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505
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506 # long action name; start on the next line
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507 else:
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508 tup = self._current_indent, '', action_header
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509 action_header = '%*s%s\n' % tup
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510 indent_first = help_position
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511
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512 # collect the pieces of the action help
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513 parts = [action_header]
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514
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515 # if there was help for the action, add lines of help text
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516 if action.help:
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517 help_text = self._expand_help(action)
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518 help_lines = self._split_lines(help_text, help_width)
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519 parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
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520 for line in help_lines[1:]:
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521 parts.append('%*s%s\n' % (help_position, '', line))
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522
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523 # or add a newline if the description doesn't end with one
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524 elif not action_header.endswith('\n'):
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525 parts.append('\n')
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526
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527 # if there are any sub-actions, add their help as well
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528 for subaction in self._iter_indented_subactions(action):
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529 parts.append(self._format_action(subaction))
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530
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531 # return a single string
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532 return self._join_parts(parts)
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533
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534 def _format_action_invocation(self, action):
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535 if not action.option_strings:
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536 default = self._get_default_metavar_for_positional(action)
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537 metavar, = self._metavar_formatter(action, default)(1)
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538 return metavar
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539
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540 else:
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541 parts = []
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542
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543 # if the Optional doesn't take a value, format is:
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544 # -s, --long
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545 if action.nargs == 0:
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546 parts.extend(action.option_strings)
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547
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548 # if the Optional takes a value, format is:
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549 # -s ARGS, --long ARGS
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550 else:
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551 default = self._get_default_metavar_for_optional(action)
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552 args_string = self._format_args(action, default)
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553 for option_string in action.option_strings:
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554 parts.append('%s %s' % (option_string, args_string))
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555
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556 return ', '.join(parts)
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557
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558 def _metavar_formatter(self, action, default_metavar):
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559 if action.metavar is not None:
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560 result = action.metavar
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561 elif action.choices is not None:
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562 choice_strs = [str(choice) for choice in action.choices]
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563 result = '{%s}' % ','.join(choice_strs)
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564 else:
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565 result = default_metavar
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566
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567 def format(tuple_size):
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568 if isinstance(result, tuple):
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569 return result
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570 else:
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571 return (result, ) * tuple_size
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572 return format
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573
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574 def _format_args(self, action, default_metavar):
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575 get_metavar = self._metavar_formatter(action, default_metavar)
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576 if action.nargs is None:
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577 result = '%s' % get_metavar(1)
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578 elif action.nargs == OPTIONAL:
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579 result = '[%s]' % get_metavar(1)
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580 elif action.nargs == ZERO_OR_MORE:
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581 result = '[%s [%s ...]]' % get_metavar(2)
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582 elif action.nargs == ONE_OR_MORE:
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583 result = '%s [%s ...]' % get_metavar(2)
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584 elif action.nargs == REMAINDER:
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585 result = '...'
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586 elif action.nargs == PARSER:
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587 result = '%s ...' % get_metavar(1)
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588 else:
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589 formats = ['%s' for _ in range(action.nargs)]
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590 result = ' '.join(formats) % get_metavar(action.nargs)
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591 return result
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592
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593 def _expand_help(self, action):
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594 params = dict(vars(action), prog=self._prog)
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595 for name in list(params):
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596 if params[name] is SUPPRESS:
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597 del params[name]
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598 for name in list(params):
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599 if hasattr(params[name], '__name__'):
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600 params[name] = params[name].__name__
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601 if params.get('choices') is not None:
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602 choices_str = ', '.join([str(c) for c in params['choices']])
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603 params['choices'] = choices_str
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604 return self._get_help_string(action) % params
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605
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606 def _iter_indented_subactions(self, action):
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607 try:
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608 get_subactions = action._get_subactions
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609 except AttributeError:
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610 pass
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611 else:
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612 self._indent()
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613 for subaction in get_subactions():
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614 yield subaction
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615 self._dedent()
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616
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617 def _split_lines(self, text, width):
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618 text = self._whitespace_matcher.sub(' ', text).strip()
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619 return _textwrap.wrap(text, width)
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620
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621 def _fill_text(self, text, width, indent):
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622 text = self._whitespace_matcher.sub(' ', text).strip()
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623 return _textwrap.fill(text, width, initial_indent=indent,
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624 subsequent_indent=indent)
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625
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626 def _get_help_string(self, action):
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627 return action.help
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628
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629 def _get_default_metavar_for_optional(self, action):
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630 return action.dest.upper()
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631
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632 def _get_default_metavar_for_positional(self, action):
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633 return action.dest
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634
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635
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636 class RawDescriptionHelpFormatter(HelpFormatter):
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637 """Help message formatter which retains any formatting in descriptions.
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638
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639 Only the name of this class is considered a public API. All the methods
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640 provided by the class are considered an implementation detail.
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641 """
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642
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643 def _fill_text(self, text, width, indent):
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644 return ''.join([indent + line for line in text.splitlines(True)])
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645
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646
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647 class RawTextHelpFormatter(RawDescriptionHelpFormatter):
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648 """Help message formatter which retains formatting of all help text.
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649
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650 Only the name of this class is considered a public API. All the methods
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651 provided by the class are considered an implementation detail.
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652 """
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653
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654 def _split_lines(self, text, width):
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655 return text.splitlines()
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656
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657
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658 class ArgumentDefaultsHelpFormatter(HelpFormatter):
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659 """Help message formatter which adds default values to argument help.
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660
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661 Only the name of this class is considered a public API. All the methods
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662 provided by the class are considered an implementation detail.
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663 """
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664
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665 def _get_help_string(self, action):
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666 help = action.help
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667 if '%(default)' not in action.help:
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668 if action.default is not SUPPRESS:
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669 defaulting_nargs = [OPTIONAL, ZERO_OR_MORE]
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670 if action.option_strings or action.nargs in defaulting_nargs:
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671 help += ' (default: %(default)s)'
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672 return help
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673
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674
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675 class MetavarTypeHelpFormatter(HelpFormatter):
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676 """Help message formatter which uses the argument 'type' as the default
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677 metavar value (instead of the argument 'dest')
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678
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diff changeset
679 Only the name of this class is considered a public API. All the methods
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680 provided by the class are considered an implementation detail.
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681 """
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diff changeset
682
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683 def _get_default_metavar_for_optional(self, action):
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684 return action.type.__name__
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685
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diff changeset
686 def _get_default_metavar_for_positional(self, action):
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diff changeset
687 return action.type.__name__
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688
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diff changeset
689
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690
59275
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691 # =====================
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692 # Options and Arguments
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693 # =====================
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694
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695 def _get_action_name(argument):
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696 if argument is None:
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697 return None
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698 elif argument.option_strings:
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699 return '/'.join(argument.option_strings)
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700 elif argument.metavar not in (None, SUPPRESS):
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701 return argument.metavar
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702 elif argument.dest not in (None, SUPPRESS):
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703 return argument.dest
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704 else:
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705 return None
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706
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707
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708 class ArgumentError(Exception):
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709 """An error from creating or using an argument (optional or positional).
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710
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711 The string value of this exception is the message, augmented with
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712 information about the argument that caused it.
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713 """
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714
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715 def __init__(self, argument, message):
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716 self.argument_name = _get_action_name(argument)
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717 self.message = message
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718
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719 def __str__(self):
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720 if self.argument_name is None:
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721 format = '%(message)s'
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722 else:
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723 format = 'argument %(argument_name)s: %(message)s'
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724 return format % dict(message=self.message,
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725 argument_name=self.argument_name)
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726
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727
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728 class ArgumentTypeError(Exception):
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diff changeset
729 """An error from trying to convert a command line string to a type."""
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diff changeset
730 pass
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diff changeset
731
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732
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733 # ==============
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734 # Action classes
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735 # ==============
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736
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737 class Action(_AttributeHolder):
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738 """Information about how to convert command line strings to Python objects.
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739
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740 Action objects are used by an ArgumentParser to represent the information
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741 needed to parse a single argument from one or more strings from the
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742 command line. The keyword arguments to the Action constructor are also
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743 all attributes of Action instances.
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744
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745 Keyword Arguments:
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746
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747 - option_strings -- A list of command-line option strings which
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748 should be associated with this action.
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749
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750 - dest -- The name of the attribute to hold the created object(s)
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751
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752 - nargs -- The number of command-line arguments that should be
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753 consumed. By default, one argument will be consumed and a single
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754 value will be produced. Other values include:
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755 - N (an integer) consumes N arguments (and produces a list)
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756 - '?' consumes zero or one arguments
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757 - '*' consumes zero or more arguments (and produces a list)
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758 - '+' consumes one or more arguments (and produces a list)
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759 Note that the difference between the default and nargs=1 is that
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760 with the default, a single value will be produced, while with
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761 nargs=1, a list containing a single value will be produced.
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762
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763 - const -- The value to be produced if the option is specified and the
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764 option uses an action that takes no values.
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765
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766 - default -- The value to be produced if the option is not specified.
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767
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768 - type -- The type which the command-line arguments should be converted
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769 to, should be one of 'string', 'int', 'float', 'complex' or a
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770 callable object that accepts a single string argument. If None,
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771 'string' is assumed.
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diff changeset
772
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773 - choices -- A container of values that should be allowed. If not None,
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774 after a command-line argument has been converted to the appropriate
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775 type, an exception will be raised if it is not a member of this
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776 collection.
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777
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778 - required -- True if the action must always be specified at the
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779 command line. This is only meaningful for optional command-line
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780 arguments.
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781
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782 - help -- The help string describing the argument.
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783
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784 - metavar -- The name to be used for the option's argument with the
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785 help string. If None, the 'dest' value will be used as the name.
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786 """
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diff changeset
787
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788 def __init__(self,
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789 option_strings,
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diff changeset
790 dest,
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791 nargs=None,
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792 const=None,
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793 default=None,
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794 type=None,
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795 choices=None,
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796 required=False,
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797 help=None,
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798 metavar=None):
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799 self.option_strings = option_strings
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800 self.dest = dest
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801 self.nargs = nargs
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802 self.const = const
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803 self.default = default
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804 self.type = type
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805 self.choices = choices
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806 self.required = required
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807 self.help = help
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808 self.metavar = metavar
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809
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810 def _get_kwargs(self):
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811 names = [
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812 'option_strings',
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813 'dest',
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814 'nargs',
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815 'const',
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816 'default',
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817 'type',
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818 'choices',
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819 'help',
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820 'metavar',
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821 ]
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822 return [(name, getattr(self, name)) for name in names]
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823
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824 def __call__(self, parser, namespace, values, option_string=None):
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825 raise NotImplementedError(_('.__call__() not defined'))
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diff changeset
826
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diff changeset
827
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828 class _StoreAction(Action):
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diff changeset
829
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830 def __init__(self,
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831 option_strings,
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832 dest,
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833 nargs=None,
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834 const=None,
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835 default=None,
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836 type=None,
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837 choices=None,
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838 required=False,
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839 help=None,
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840 metavar=None):
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841 if nargs == 0:
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842 raise ValueError('nargs for store actions must be > 0; if you '
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843 'have nothing to store, actions such as store '
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diff changeset
844 'true or store const may be more appropriate')
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845 if const is not None and nargs != OPTIONAL:
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846 raise ValueError('nargs must be %r to supply const' % OPTIONAL)
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847 super(_StoreAction, self).__init__(
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848 option_strings=option_strings,
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849 dest=dest,
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850 nargs=nargs,
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851 const=const,
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852 default=default,
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853 type=type,
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854 choices=choices,
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855 required=required,
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856 help=help,
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857 metavar=metavar)
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858
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859 def __call__(self, parser, namespace, values, option_string=None):
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860 setattr(namespace, self.dest, values)
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861
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862
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863 class _StoreConstAction(Action):
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864
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diff changeset
865 def __init__(self,
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866 option_strings,
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867 dest,
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868 const,
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869 default=None,
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870 required=False,
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871 help=None,
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872 metavar=None):
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873 super(_StoreConstAction, self).__init__(
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874 option_strings=option_strings,
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875 dest=dest,
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876 nargs=0,
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877 const=const,
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878 default=default,
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879 required=required,
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880 help=help)
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881
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diff changeset
882 def __call__(self, parser, namespace, values, option_string=None):
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diff changeset
883 setattr(namespace, self.dest, self.const)
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diff changeset
884
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diff changeset
885
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diff changeset
886 class _StoreTrueAction(_StoreConstAction):
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diff changeset
887
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diff changeset
888 def __init__(self,
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diff changeset
889 option_strings,
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diff changeset
890 dest,
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891 default=False,
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892 required=False,
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893 help=None):
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894 super(_StoreTrueAction, self).__init__(
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diff changeset
895 option_strings=option_strings,
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diff changeset
896 dest=dest,
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897 const=True,
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diff changeset
898 default=default,
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diff changeset
899 required=required,
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diff changeset
900 help=help)
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diff changeset
901
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diff changeset
902
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diff changeset
903 class _StoreFalseAction(_StoreConstAction):
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diff changeset
904
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diff changeset
905 def __init__(self,
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diff changeset
906 option_strings,
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diff changeset
907 dest,
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diff changeset
908 default=True,
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diff changeset
909 required=False,
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910 help=None):
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911 super(_StoreFalseAction, self).__init__(
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diff changeset
912 option_strings=option_strings,
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913 dest=dest,
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914 const=False,
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915 default=default,
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916 required=required,
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diff changeset
917 help=help)
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diff changeset
918
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diff changeset
919
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diff changeset
920 class _AppendAction(Action):
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diff changeset
921
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922 def __init__(self,
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923 option_strings,
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diff changeset
924 dest,
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diff changeset
925 nargs=None,
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diff changeset
926 const=None,
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diff changeset
927 default=None,
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928 type=None,
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929 choices=None,
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930 required=False,
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931 help=None,
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932 metavar=None):
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933 if nargs == 0:
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934 raise ValueError('nargs for append actions must be > 0; if arg '
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diff changeset
935 'strings are not supplying the value to append, '
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diff changeset
936 'the append const action may be more appropriate')
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937 if const is not None and nargs != OPTIONAL:
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938 raise ValueError('nargs must be %r to supply const' % OPTIONAL)
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diff changeset
939 super(_AppendAction, self).__init__(
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940 option_strings=option_strings,
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diff changeset
941 dest=dest,
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942 nargs=nargs,
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943 const=const,
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944 default=default,
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945 type=type,
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946 choices=choices,
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947 required=required,
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948 help=help,
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949 metavar=metavar)
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950
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diff changeset
951 def __call__(self, parser, namespace, values, option_string=None):
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952 items = _copy.copy(_ensure_value(namespace, self.dest, []))
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953 items.append(values)
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954 setattr(namespace, self.dest, items)
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955
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956
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diff changeset
957 class _AppendConstAction(Action):
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diff changeset
958
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959 def __init__(self,
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960 option_strings,
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diff changeset
961 dest,
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diff changeset
962 const,
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963 default=None,
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964 required=False,
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965 help=None,
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966 metavar=None):
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967 super(_AppendConstAction, self).__init__(
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968 option_strings=option_strings,
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969 dest=dest,
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970 nargs=0,
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971 const=const,
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972 default=default,
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973 required=required,
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974 help=help,
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975 metavar=metavar)
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976
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977 def __call__(self, parser, namespace, values, option_string=None):
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978 items = _copy.copy(_ensure_value(namespace, self.dest, []))
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979 items.append(self.const)
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980 setattr(namespace, self.dest, items)
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981
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diff changeset
982
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983 class _CountAction(Action):
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984
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985 def __init__(self,
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986 option_strings,
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987 dest,
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988 default=None,
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989 required=False,
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990 help=None):
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991 super(_CountAction, self).__init__(
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992 option_strings=option_strings,
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993 dest=dest,
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994 nargs=0,
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995 default=default,
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996 required=required,
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997 help=help)
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998
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999 def __call__(self, parser, namespace, values, option_string=None):
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1000 new_count = _ensure_value(namespace, self.dest, 0) + 1
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1001 setattr(namespace, self.dest, new_count)
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1002
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1003
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1004 class _HelpAction(Action):
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1005
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diff changeset
1006 def __init__(self,
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1007 option_strings,
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1008 dest=SUPPRESS,
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1009 default=SUPPRESS,
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1010 help=None):
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1011 super(_HelpAction, self).__init__(
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1012 option_strings=option_strings,
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1013 dest=dest,
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1014 default=default,
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1015 nargs=0,
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1016 help=help)
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1017
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1018 def __call__(self, parser, namespace, values, option_string=None):
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1019 parser.print_help()
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1020 parser.exit()
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1021
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1022
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1023 class _VersionAction(Action):
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1024
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1025 def __init__(self,
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1026 option_strings,
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1027 version=None,
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1028 dest=SUPPRESS,
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1029 default=SUPPRESS,
61880
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1030 help="show program's version number and exit"):
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1031 super(_VersionAction, self).__init__(
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1032 option_strings=option_strings,
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1033 dest=dest,
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1034 default=default,
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1035 nargs=0,
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1036 help=help)
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1037 self.version = version
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1038
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1039 def __call__(self, parser, namespace, values, option_string=None):
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1040 version = self.version
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1041 if version is None:
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1042 version = parser.version
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1043 formatter = parser._get_formatter()
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1044 formatter.add_text(version)
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1045 parser.exit(message=formatter.format_help())
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1046
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1047
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1048 class _SubParsersAction(Action):
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1049
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1050 class _ChoicesPseudoAction(Action):
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1051
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1052 def __init__(self, name, aliases, help):
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1053 metavar = dest = name
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diff changeset
1054 if aliases:
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1055 metavar += ' (%s)' % ', '.join(aliases)
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1056 sup = super(_SubParsersAction._ChoicesPseudoAction, self)
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diff changeset
1057 sup.__init__(option_strings=[], dest=dest, help=help,
4c0426261148 Add subparser aliases for argparse. Resolves issue 9324. Approved by Georg for beta2 on the tracker.
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1058 metavar=metavar)
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1059
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1060 def __init__(self,
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1061 option_strings,
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1062 prog,
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1063 parser_class,
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1064 dest=SUPPRESS,
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1065 help=None,
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1066 metavar=None):
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1067
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1068 self._prog_prefix = prog
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1069 self._parser_class = parser_class
69003
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diff changeset
1070 self._name_parser_map = _collections.OrderedDict()
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1071 self._choices_actions = []
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1072
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1073 super(_SubParsersAction, self).__init__(
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1074 option_strings=option_strings,
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1075 dest=dest,
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1076 nargs=PARSER,
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1077 choices=self._name_parser_map,
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1078 help=help,
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1079 metavar=metavar)
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1080
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1081 def add_parser(self, name, **kwargs):
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1082 # set prog from the existing prefix
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1083 if kwargs.get('prog') is None:
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1084 kwargs['prog'] = '%s %s' % (self._prog_prefix, name)
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1085
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diff changeset
1086 aliases = kwargs.pop('aliases', ())
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1087
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1088 # create a pseudo-action to hold the choice help
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1089 if 'help' in kwargs:
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1090 help = kwargs.pop('help')
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1091 choice_action = self._ChoicesPseudoAction(name, aliases, help)
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1092 self._choices_actions.append(choice_action)
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1093
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diff changeset
1094 # create the parser and add it to the map
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1095 parser = self._parser_class(**kwargs)
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diff changeset
1096 self._name_parser_map[name] = parser
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diff changeset
1097
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diff changeset
1098 # make parser available under aliases also
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diff changeset
1099 for alias in aliases:
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diff changeset
1100 self._name_parser_map[alias] = parser
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1101
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1102 return parser
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1103
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1104 def _get_subactions(self):
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1105 return self._choices_actions
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1106
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1107 def __call__(self, parser, namespace, values, option_string=None):
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1108 parser_name = values[0]
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1109 arg_strings = values[1:]
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1110
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1111 # set the parser name if requested
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1112 if self.dest is not SUPPRESS:
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1113 setattr(namespace, self.dest, parser_name)
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1114
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1115 # select the parser
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1116 try:
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1117 parser = self._name_parser_map[parser_name]
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1118 except KeyError:
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1119 args = {'parser_name': parser_name,
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1120 'choices': ', '.join(self._name_parser_map)}
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1121 msg = _('unknown parser %(parser_name)r (choices: %(choices)s)') % args
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1122 raise ArgumentError(self, msg)
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1123
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1124 # parse all the remaining options into the namespace
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1125 # store any unrecognized options on the object, so that the top
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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1126 # level parser can decide what to do with them
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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1127 namespace, arg_strings = parser.parse_known_args(arg_strings, namespace)
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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diff changeset
1128 if arg_strings:
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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1129 vars(namespace).setdefault(_UNRECOGNIZED_ARGS_ATTR, [])
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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1130 getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)
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1131
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1132
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1133 # ==============
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1134 # Type classes
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1135 # ==============
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1136
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1137 class FileType(object):
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1138 """Factory for creating file object types
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1139
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1140 Instances of FileType are typically passed as type= arguments to the
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1141 ArgumentParser add_argument() method.
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1142
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1143 Keyword Arguments:
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1144 - mode -- A string indicating how the file is to be opened. Accepts the
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1145 same values as the builtin open() function.
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1146 - bufsize -- The file's desired buffer size. Accepts the same values as
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1147 the builtin open() function.
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1148 """
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1149
67746
8a30a2cb4b9e Issue #9509: make argarse properly handle IOErrors raised by argparse.FileType. Approved by Georg in the tracker.
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1150 def __init__(self, mode='r', bufsize=-1):
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1151 self._mode = mode
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1152 self._bufsize = bufsize
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1153
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1154 def __call__(self, string):
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1155 # the special argument "-" means sys.std{in,out}
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1156 if string == '-':
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1157 if 'r' in self._mode:
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1158 return _sys.stdin
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1159 elif 'w' in self._mode:
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1160 return _sys.stdout
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1161 else:
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83ad00a3a489 Fix incorrect use of gettext in argparse (#10497).
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1162 msg = _('argument "-" with mode %r') % self._mode
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1163 raise ValueError(msg)
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1164
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1165 # all other arguments are used as file names
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1166 try:
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1167 return open(string, self._mode, self._bufsize)
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1168 except IOError as e:
8a30a2cb4b9e Issue #9509: make argarse properly handle IOErrors raised by argparse.FileType. Approved by Georg in the tracker.
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diff changeset
1169 message = _("can't open '%s': %s")
8a30a2cb4b9e Issue #9509: make argarse properly handle IOErrors raised by argparse.FileType. Approved by Georg in the tracker.
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1170 raise ArgumentTypeError(message % (string, e))
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1171
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1172 def __repr__(self):
67746
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diff changeset
1173 args = self._mode, self._bufsize
8a30a2cb4b9e Issue #9509: make argarse properly handle IOErrors raised by argparse.FileType. Approved by Georg in the tracker.
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1174 args_str = ', '.join(repr(arg) for arg in args if arg != -1)
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1175 return '%s(%s)' % (type(self).__name__, args_str)
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diff changeset
1176
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diff changeset
1177 # ===========================
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1178 # Optional and Positional Parsing
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diff changeset
1179 # ===========================
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1180
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1181 class Namespace(_AttributeHolder):
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diff changeset
1182 """Simple object for storing attributes.
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diff changeset
1183
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1184 Implements equality by attribute names and values, and provides a simple
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1185 string representation.
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1186 """
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diff changeset
1187
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1188 def __init__(self, **kwargs):
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1189 for name in kwargs:
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1190 setattr(self, name, kwargs[name])
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1191
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1192 def __eq__(self, other):
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1193 return vars(self) == vars(other)
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1194
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1195 def __ne__(self, other):
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diff changeset
1196 return not (self == other)
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1197
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1198 def __contains__(self, key):
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diff changeset
1199 return key in self.__dict__
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1200
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diff changeset
1201
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1202 class _ActionsContainer(object):
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diff changeset
1203
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1204 def __init__(self,
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diff changeset
1205 description,
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1206 prefix_chars,
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diff changeset
1207 argument_default,
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1208 conflict_handler):
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1209 super(_ActionsContainer, self).__init__()
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1210
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1211 self.description = description
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1212 self.argument_default = argument_default
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1213 self.prefix_chars = prefix_chars
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1214 self.conflict_handler = conflict_handler
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1215
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diff changeset
1216 # set up registries
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1217 self._registries = {}
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1218
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1219 # register actions
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1220 self.register('action', None, _StoreAction)
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1221 self.register('action', 'store', _StoreAction)
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1222 self.register('action', 'store_const', _StoreConstAction)
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1223 self.register('action', 'store_true', _StoreTrueAction)
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1224 self.register('action', 'store_false', _StoreFalseAction)
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1225 self.register('action', 'append', _AppendAction)
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1226 self.register('action', 'append_const', _AppendConstAction)
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1227 self.register('action', 'count', _CountAction)
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1228 self.register('action', 'help', _HelpAction)
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1229 self.register('action', 'version', _VersionAction)
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1230 self.register('action', 'parsers', _SubParsersAction)
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1231
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1232 # raise an exception if the conflict handler is invalid
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1233 self._get_handler()
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1234
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diff changeset
1235 # action storage
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diff changeset
1236 self._actions = []
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diff changeset
1237 self._option_string_actions = {}
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diff changeset
1238
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diff changeset
1239 # groups
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1240 self._action_groups = []
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diff changeset
1241 self._mutually_exclusive_groups = []
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diff changeset
1242
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diff changeset
1243 # defaults storage
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diff changeset
1244 self._defaults = {}
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diff changeset
1245
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diff changeset
1246 # determines whether an "option" looks like a negative number
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diff changeset
1247 self._negative_number_matcher = _re.compile(r'^-\d+$|^-\d*\.\d+$')
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diff changeset
1248
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diff changeset
1249 # whether or not there are any optionals that look like negative
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diff changeset
1250 # numbers -- uses a list so it can be shared and edited
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diff changeset
1251 self._has_negative_number_optionals = []
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diff changeset
1252
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diff changeset
1253 # ====================
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diff changeset
1254 # Registration methods
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diff changeset
1255 # ====================
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diff changeset
1256 def register(self, registry_name, value, object):
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diff changeset
1257 registry = self._registries.setdefault(registry_name, {})
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diff changeset
1258 registry[value] = object
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diff changeset
1259
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diff changeset
1260 def _registry_get(self, registry_name, value, default=None):
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diff changeset
1261 return self._registries[registry_name].get(value, default)
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1262
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diff changeset
1263 # ==================================
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diff changeset
1264 # Namespace default accessor methods
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diff changeset
1265 # ==================================
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1266 def set_defaults(self, **kwargs):
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diff changeset
1267 self._defaults.update(kwargs)
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diff changeset
1268
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1269 # if these defaults match any existing arguments, replace
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diff changeset
1270 # the previous default on the object with the new one
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diff changeset
1271 for action in self._actions:
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1272 if action.dest in kwargs:
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diff changeset
1273 action.default = kwargs[action.dest]
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diff changeset
1274
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1275 def get_default(self, dest):
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1276 for action in self._actions:
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diff changeset
1277 if action.dest == dest and action.default is not None:
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diff changeset
1278 return action.default
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diff changeset
1279 return self._defaults.get(dest, None)
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diff changeset
1280
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diff changeset
1281
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diff changeset
1282 # =======================
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1283 # Adding argument actions
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diff changeset
1284 # =======================
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diff changeset
1285 def add_argument(self, *args, **kwargs):
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diff changeset
1286 """
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diff changeset
1287 add_argument(dest, ..., name=value, ...)
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diff changeset
1288 add_argument(option_string, option_string, ..., name=value, ...)
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diff changeset
1289 """
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diff changeset
1290
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diff changeset
1291 # if no positional args are supplied or only one is supplied and
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diff changeset
1292 # it doesn't look like an option string, parse a positional
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diff changeset
1293 # argument
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diff changeset
1294 chars = self.prefix_chars
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diff changeset
1295 if not args or len(args) == 1 and args[0][0] not in chars:
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diff changeset
1296 if args and 'dest' in kwargs:
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diff changeset
1297 raise ValueError('dest supplied twice for positional argument')
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diff changeset
1298 kwargs = self._get_positional_kwargs(*args, **kwargs)
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diff changeset
1299
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1300 # otherwise, we're adding an optional argument
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1301 else:
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1302 kwargs = self._get_optional_kwargs(*args, **kwargs)
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diff changeset
1303
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diff changeset
1304 # if no default was supplied, use the parser-level default
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diff changeset
1305 if 'default' not in kwargs:
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diff changeset
1306 dest = kwargs['dest']
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diff changeset
1307 if dest in self._defaults:
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diff changeset
1308 kwargs['default'] = self._defaults[dest]
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diff changeset
1309 elif self.argument_default is not None:
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diff changeset
1310 kwargs['default'] = self.argument_default
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diff changeset
1311
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1312 # create the action object, and add it to the parser
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diff changeset
1313 action_class = self._pop_action_class(kwargs)
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diff changeset
1314 if not _callable(action_class):
69126
69ab5251f3f0 Issue #9347: Fix formatting for tuples in argparse type= error messages.
Steven Bethard <steven.bethard@gmail.com>
parents: 69003
diff changeset
1315 raise ValueError('unknown action "%s"' % (action_class,))
59275
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diff changeset
1316 action = action_class(**kwargs)
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diff changeset
1317
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diff changeset
1318 # raise an error if the action type is not callable
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diff changeset
1319 type_func = self._registry_get('type', action.type, action.type)
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diff changeset
1320 if not _callable(type_func):
69126
69ab5251f3f0 Issue #9347: Fix formatting for tuples in argparse type= error messages.
Steven Bethard <steven.bethard@gmail.com>
parents: 69003
diff changeset
1321 raise ValueError('%r is not callable' % (type_func,))
59275
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1322
68967
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1323 # raise an error if the metavar does not match the type
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1324 if hasattr(self, "_get_formatter"):
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1325 try:
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1326 self._get_formatter()._format_args(action, None)
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1327 except TypeError:
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1328 raise ValueError("length of metavar tuple does not match nargs")
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1329
59275
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diff changeset
1330 return self._add_action(action)
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diff changeset
1331
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diff changeset
1332 def add_argument_group(self, *args, **kwargs):
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diff changeset
1333 group = _ArgumentGroup(self, *args, **kwargs)
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diff changeset
1334 self._action_groups.append(group)
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diff changeset
1335 return group
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diff changeset
1336
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diff changeset
1337 def add_mutually_exclusive_group(self, **kwargs):
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diff changeset
1338 group = _MutuallyExclusiveGroup(self, **kwargs)
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diff changeset
1339 self._mutually_exclusive_groups.append(group)
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diff changeset
1340 return group
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diff changeset
1341
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1342 def _add_action(self, action):
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diff changeset
1343 # resolve any conflicts
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diff changeset
1344 self._check_conflict(action)
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diff changeset
1345
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diff changeset
1346 # add to actions list
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diff changeset
1347 self._actions.append(action)
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diff changeset
1348 action.container = self
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diff changeset
1349
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1350 # index the action by any option strings it has
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1351 for option_string in action.option_strings:
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diff changeset
1352 self._option_string_actions[option_string] = action
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diff changeset
1353
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1354 # set the flag if any option strings look like negative numbers
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diff changeset
1355 for option_string in action.option_strings:
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diff changeset
1356 if self._negative_number_matcher.match(option_string):
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diff changeset
1357 if not self._has_negative_number_optionals:
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diff changeset
1358 self._has_negative_number_optionals.append(True)
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diff changeset
1359
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diff changeset
1360 # return the created action
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diff changeset
1361 return action
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diff changeset
1362
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diff changeset
1363 def _remove_action(self, action):
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diff changeset
1364 self._actions.remove(action)
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diff changeset
1365
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diff changeset
1366 def _add_container_actions(self, container):
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diff changeset
1367 # collect groups by titles
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diff changeset
1368 title_group_map = {}
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parents: 59258
diff changeset
1369 for group in self._action_groups:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1370 if group.title in title_group_map:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1371 msg = _('cannot merge actions - two groups are named %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1372 raise ValueError(msg % (group.title))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1373 title_group_map[group.title] = group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1374
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1375 # map each action to its group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1376 group_map = {}
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1377 for group in container._action_groups:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1378
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1379 # if a group with the title exists, use that, otherwise
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1380 # create a new group matching the container's group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1381 if group.title not in title_group_map:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1382 title_group_map[group.title] = self.add_argument_group(
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1383 title=group.title,
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1384 description=group.description,
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1385 conflict_handler=group.conflict_handler)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1386
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1387 # map the actions to their new group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1388 for action in group._group_actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1389 group_map[action] = title_group_map[group.title]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1390
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1391 # add container's mutually exclusive groups
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1392 # NOTE: if add_mutually_exclusive_group ever gains title= and
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1393 # description= then this code will need to be expanded as above
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1394 for group in container._mutually_exclusive_groups:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1395 mutex_group = self.add_mutually_exclusive_group(
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1396 required=group.required)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1397
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1398 # map the actions to their new mutex group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1399 for action in group._group_actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1400 group_map[action] = mutex_group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1401
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1402 # add all actions to this container or their group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1403 for action in container._actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1404 group_map.get(action, self)._add_action(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1405
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1406 def _get_positional_kwargs(self, dest, **kwargs):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1407 # make sure required is not specified
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1408 if 'required' in kwargs:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1409 msg = _("'required' is an invalid argument for positionals")
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1410 raise TypeError(msg)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1411
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1412 # mark positional arguments as required if at least one is
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1413 # always required
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1414 if kwargs.get('nargs') not in [OPTIONAL, ZERO_OR_MORE]:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1415 kwargs['required'] = True
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1416 if kwargs.get('nargs') == ZERO_OR_MORE and 'default' not in kwargs:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1417 kwargs['required'] = True
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1418
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1419 # return the keyword arguments with no option strings
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1420 return dict(kwargs, dest=dest, option_strings=[])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1421
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1422 def _get_optional_kwargs(self, *args, **kwargs):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1423 # determine short and long option strings
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1424 option_strings = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1425 long_option_strings = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1426 for option_string in args:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1427 # error on strings that don't start with an appropriate prefix
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1428 if not option_string[0] in self.prefix_chars:
66661
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1429 args = {'option': option_string,
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1430 'prefix_chars': self.prefix_chars}
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1431 msg = _('invalid option string %(option)r: '
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1432 'must start with a character %(prefix_chars)r')
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1433 raise ValueError(msg % args)
59275
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1434
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1435 # strings starting with two prefix characters are long options
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1436 option_strings.append(option_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1437 if option_string[0] in self.prefix_chars:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1438 if len(option_string) > 1:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1439 if option_string[1] in self.prefix_chars:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1440 long_option_strings.append(option_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1441
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1442 # infer destination, '--foo-bar' -> 'foo_bar' and '-x' -> 'x'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1443 dest = kwargs.pop('dest', None)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1444 if dest is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1445 if long_option_strings:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1446 dest_option_string = long_option_strings[0]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1447 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1448 dest_option_string = option_strings[0]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1449 dest = dest_option_string.lstrip(self.prefix_chars)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1450 if not dest:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1451 msg = _('dest= is required for options like %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1452 raise ValueError(msg % option_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1453 dest = dest.replace('-', '_')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1454
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1455 # return the updated keyword arguments
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1456 return dict(kwargs, dest=dest, option_strings=option_strings)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1457
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1458 def _pop_action_class(self, kwargs, default=None):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1459 action = kwargs.pop('action', default)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1460 return self._registry_get('action', action, action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1461
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1462 def _get_handler(self):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1463 # determine function from conflict handler string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1464 handler_func_name = '_handle_conflict_%s' % self.conflict_handler
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1465 try:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1466 return getattr(self, handler_func_name)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1467 except AttributeError:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1468 msg = _('invalid conflict_resolution value: %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1469 raise ValueError(msg % self.conflict_handler)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1470
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1471 def _check_conflict(self, action):
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parents: 59258
diff changeset
1472
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1473 # find all options that conflict with this option
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1474 confl_optionals = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1475 for option_string in action.option_strings:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1476 if option_string in self._option_string_actions:
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parents: 59258
diff changeset
1477 confl_optional = self._option_string_actions[option_string]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1478 confl_optionals.append((option_string, confl_optional))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1479
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1480 # resolve any conflicts
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1481 if confl_optionals:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1482 conflict_handler = self._get_handler()
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1483 conflict_handler(action, confl_optionals)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1484
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1485 def _handle_conflict_error(self, action, conflicting_actions):
66721
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
1486 message = ngettext('conflicting option string: %s',
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
1487 'conflicting option strings: %s',
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
1488 len(conflicting_actions))
59275
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1489 conflict_string = ', '.join([option_string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1490 for option_string, action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1491 in conflicting_actions])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1492 raise ArgumentError(action, message % conflict_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1493
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1494 def _handle_conflict_resolve(self, action, conflicting_actions):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1495
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1496 # remove all conflicting options
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1497 for option_string, action in conflicting_actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1498
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1499 # remove the conflicting option
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1500 action.option_strings.remove(option_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1501 self._option_string_actions.pop(option_string, None)
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parents: 59258
diff changeset
1502
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diff changeset
1503 # if the option now has no option string, remove it from the
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1504 # container holding it
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1505 if not action.option_strings:
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1506 action.container._remove_action(action)
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1507
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1508
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1509 class _ArgumentGroup(_ActionsContainer):
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1510
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1511 def __init__(self, container, title=None, description=None, **kwargs):
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1512 # add any missing keyword arguments by checking the container
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1513 update = kwargs.setdefault
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1514 update('conflict_handler', container.conflict_handler)
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1515 update('prefix_chars', container.prefix_chars)
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1516 update('argument_default', container.argument_default)
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1517 super_init = super(_ArgumentGroup, self).__init__
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1518 super_init(description=description, **kwargs)
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1519
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1520 # group attributes
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1521 self.title = title
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1522 self._group_actions = []
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1523
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1524 # share most attributes with the container
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1525 self._registries = container._registries
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1526 self._actions = container._actions
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1527 self._option_string_actions = container._option_string_actions
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1528 self._defaults = container._defaults
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1529 self._has_negative_number_optionals = \
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diff changeset
1530 container._has_negative_number_optionals
67819
2bef7ab6256b #10680: fix mutually exclusive arguments in argument groups.
Georg Brandl <georg@python.org>
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diff changeset
1531 self._mutually_exclusive_groups = container._mutually_exclusive_groups
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1532
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1533 def _add_action(self, action):
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1534 action = super(_ArgumentGroup, self)._add_action(action)
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1535 self._group_actions.append(action)
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1536 return action
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1537
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1538 def _remove_action(self, action):
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1539 super(_ArgumentGroup, self)._remove_action(action)
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1540 self._group_actions.remove(action)
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1541
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1542
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1543 class _MutuallyExclusiveGroup(_ArgumentGroup):
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1544
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1545 def __init__(self, container, required=False):
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1546 super(_MutuallyExclusiveGroup, self).__init__(container)
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1547 self.required = required
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1548 self._container = container
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1549
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1550 def _add_action(self, action):
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1551 if action.required:
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1552 msg = _('mutually exclusive arguments must be optional')
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diff changeset
1553 raise ValueError(msg)
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1554 action = self._container._add_action(action)
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1555 self._group_actions.append(action)
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1556 return action
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1557
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1558 def _remove_action(self, action):
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1559 self._container._remove_action(action)
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1560 self._group_actions.remove(action)
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1561
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1562
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1563 class ArgumentParser(_AttributeHolder, _ActionsContainer):
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diff changeset
1564 """Object for parsing command line strings into Python objects.
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1565
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1566 Keyword Arguments:
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1567 - prog -- The name of the program (default: sys.argv[0])
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1568 - usage -- A usage message (default: auto-generated from arguments)
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1569 - description -- A description of what the program does
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1570 - epilog -- Text following the argument descriptions
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1571 - parents -- Parsers whose arguments should be copied into this one
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1572 - formatter_class -- HelpFormatter class for printing help messages
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1573 - prefix_chars -- Characters that prefix optional arguments
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1574 - fromfile_prefix_chars -- Characters that prefix files containing
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diff changeset
1575 additional arguments
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1576 - argument_default -- The default value for all arguments
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1577 - conflict_handler -- String indicating how to handle conflicts
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1578 - add_help -- Add a -h/-help option
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diff changeset
1579 """
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1580
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1581 def __init__(self,
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1582 prog=None,
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1583 usage=None,
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1584 description=None,
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1585 epilog=None,
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1586 version=None,
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diff changeset
1587 parents=[],
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1588 formatter_class=HelpFormatter,
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1589 prefix_chars='-',
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1590 fromfile_prefix_chars=None,
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1591 argument_default=None,
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1592 conflict_handler='error',
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1593 add_help=True):
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1594
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1595 if version is not None:
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1596 import warnings
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1597 warnings.warn(
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diff changeset
1598 """The "version" argument to ArgumentParser is deprecated. """
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diff changeset
1599 """Please use """
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1600 """"add_argument(..., action='version', version="N", ...)" """
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diff changeset
1601 """instead""", DeprecationWarning)
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diff changeset
1602
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diff changeset
1603 superinit = super(ArgumentParser, self).__init__
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diff changeset
1604 superinit(description=description,
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1605 prefix_chars=prefix_chars,
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1606 argument_default=argument_default,
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1607 conflict_handler=conflict_handler)
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1608
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1609 # default setting for prog
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1610 if prog is None:
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diff changeset
1611 prog = _os.path.basename(_sys.argv[0])
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1612
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1613 self.prog = prog
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1614 self.usage = usage
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1615 self.epilog = epilog
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1616 self.version = version
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1617 self.formatter_class = formatter_class
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1618 self.fromfile_prefix_chars = fromfile_prefix_chars
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1619 self.add_help = add_help
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1620
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1621 add_group = self.add_argument_group
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1622 self._positionals = add_group(_('positional arguments'))
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1623 self._optionals = add_group(_('optional arguments'))
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1624 self._subparsers = None
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1625
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1626 # register types
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1627 def identity(string):
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1628 return string
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1629 self.register('type', None, identity)
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1630
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1631 # add help and version arguments if necessary
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1632 # (using explicit default to override global argument_default)
63690
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1633 default_prefix = '-' if '-' in prefix_chars else prefix_chars[0]
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1634 if self.add_help:
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1635 self.add_argument(
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1636 default_prefix+'h', default_prefix*2+'help',
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1637 action='help', default=SUPPRESS,
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1638 help=_('show this help message and exit'))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1639 if self.version:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1640 self.add_argument(
63690
2850bd919277 #9444: use first of prefix_chars for help opt instead of raising error
R. David Murray <rdmurray@bitdance.com>
parents: 61880
diff changeset
1641 default_prefix+'v', default_prefix*2+'version',
2850bd919277 #9444: use first of prefix_chars for help opt instead of raising error
R. David Murray <rdmurray@bitdance.com>
parents: 61880
diff changeset
1642 action='version', default=SUPPRESS,
59275
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1643 version=self.version,
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1644 help=_("show program's version number and exit"))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1645
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1646 # add parent arguments and defaults
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1647 for parent in parents:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1648 self._add_container_actions(parent)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1649 try:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1650 defaults = parent._defaults
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1651 except AttributeError:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1652 pass
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1653 else:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1654 self._defaults.update(defaults)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1655
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1656 # =======================
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1657 # Pretty __repr__ methods
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1658 # =======================
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1659 def _get_kwargs(self):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1660 names = [
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1661 'prog',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1662 'usage',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1663 'description',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1664 'version',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1665 'formatter_class',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1666 'conflict_handler',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1667 'add_help',
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1668 ]
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1669 return [(name, getattr(self, name)) for name in names]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1670
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1671 # ==================================
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1672 # Optional/Positional adding methods
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1673 # ==================================
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1674 def add_subparsers(self, **kwargs):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1675 if self._subparsers is not None:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1676 self.error(_('cannot have multiple subparser arguments'))
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1677
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1678 # add the parser class to the arguments if it's not present
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1679 kwargs.setdefault('parser_class', type(self))
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1680
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1681 if 'title' in kwargs or 'description' in kwargs:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1682 title = _(kwargs.pop('title', 'subcommands'))
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1683 description = _(kwargs.pop('description', None))
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1684 self._subparsers = self.add_argument_group(title, description)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1685 else:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1686 self._subparsers = self._positionals
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1687
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1688 # prog defaults to the usage message of this parser, skipping
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1689 # optional arguments and with no "usage:" prefix
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1690 if kwargs.get('prog') is None:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1691 formatter = self._get_formatter()
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1692 positionals = self._get_positional_actions()
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1693 groups = self._mutually_exclusive_groups
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1694 formatter.add_usage(self.usage, positionals, groups, '')
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1695 kwargs['prog'] = formatter.format_help().strip()
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1696
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1697 # create the parsers action and add it to the positionals list
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1698 parsers_class = self._pop_action_class(kwargs, 'parsers')
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1699 action = parsers_class(option_strings=[], **kwargs)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1700 self._subparsers._add_action(action)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1701
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1702 # return the created parsers action
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1703 return action
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1704
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1705 def _add_action(self, action):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1706 if action.option_strings:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1707 self._optionals._add_action(action)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1708 else:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1709 self._positionals._add_action(action)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1710 return action
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1711
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1712 def _get_optional_actions(self):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1713 return [action
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1714 for action in self._actions
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1715 if action.option_strings]
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1716
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1717 def _get_positional_actions(self):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1718 return [action
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1719 for action in self._actions
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1720 if not action.option_strings]
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1721
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1722 # =====================================
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1723 # Command line argument parsing methods
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1724 # =====================================
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1725 def parse_args(self, args=None, namespace=None):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1726 args, argv = self.parse_known_args(args, namespace)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1727 if argv:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1728 msg = _('unrecognized arguments: %s')
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1729 self.error(msg % ' '.join(argv))
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1730 return args
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1731
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1732 def parse_known_args(self, args=None, namespace=None):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1733 # args default to the system args
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1734 if args is None:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1735 args = _sys.argv[1:]
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1736
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1737 # default Namespace built from parser defaults
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1738 if namespace is None:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1739 namespace = Namespace()
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1740
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1741 # add any action defaults that aren't present
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1742 for action in self._actions:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1743 if action.dest is not SUPPRESS:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1744 if not hasattr(namespace, action.dest):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1745 if action.default is not SUPPRESS:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1746 default = action.default
59282
b30f8ce82167 Merged revisions 78600-78601 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59275
diff changeset
1747 if isinstance(action.default, str):
59275
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1748 default = self._get_value(action, default)
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1749 setattr(namespace, action.dest, default)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1750
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1751 # add any parser defaults that aren't present
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1752 for dest in self._defaults:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1753 if not hasattr(namespace, dest):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1754 setattr(namespace, dest, self._defaults[dest])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1755
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1756 # parse the arguments and exit if there are any errors
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1757 try:
65887
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1758 namespace, args = self._parse_known_args(args, namespace)
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1759 if hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1760 args.extend(getattr(namespace, _UNRECOGNIZED_ARGS_ATTR))
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1761 delattr(namespace, _UNRECOGNIZED_ARGS_ATTR)
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1762 return namespace, args
59275
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1763 except ArgumentError:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1764 err = _sys.exc_info()[1]
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1765 self.error(str(err))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1766
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1767 def _parse_known_args(self, arg_strings, namespace):
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1768 # replace arg strings that are file references
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1769 if self.fromfile_prefix_chars is not None:
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1770 arg_strings = self._read_args_from_files(arg_strings)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1771
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1772 # map all mutually exclusive arguments to the other arguments
12bcb69938b3 Merged revisions 78586-78593 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1773 # they can't occur with
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1774 action_conflicts = {}
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1775 for mutex_group in self._mutually_exclusive_groups:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1776 group_actions = mutex_group._group_actions
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1777 for i, mutex_action in enumerate(mutex_group._group_actions):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1778 conflicts = action_conflicts.setdefault(mutex_action, [])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1779 conflicts.extend(group_actions[:i])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1780 conflicts.extend(group_actions[i + 1:])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1781
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1782 # find all option indices, and determine the arg_string_pattern
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1783 # which has an 'O' if there is an option at an index,
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1784 # an 'A' if there is an argument, or a '-' if there is a '--'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1785 option_string_indices = {}
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1786 arg_string_pattern_parts = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1787 arg_strings_iter = iter(arg_strings)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1788 for i, arg_string in enumerate(arg_strings_iter):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1789
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1790 # all args after -- are non-options
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1791 if arg_string == '--':
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1792 arg_string_pattern_parts.append('-')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1793 for arg_string in arg_strings_iter:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1794 arg_string_pattern_parts.append('A')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1795
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1796 # otherwise, add the arg to the arg strings
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1797 # and note the index if it was an option
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1798 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1799 option_tuple = self._parse_optional(arg_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1800 if option_tuple is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1801 pattern = 'A'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1802 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1803 option_string_indices[i] = option_tuple
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1804 pattern = 'O'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1805 arg_string_pattern_parts.append(pattern)
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parents: 59258
diff changeset
1806
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diff changeset
1807 # join the pieces together to form the pattern
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1808 arg_strings_pattern = ''.join(arg_string_pattern_parts)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1809
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parents: 59258
diff changeset
1810 # converts arg strings to the appropriate and then takes the action
59282
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1811 seen_actions = set()
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Benjamin Peterson <benjamin@python.org>
parents: 59275
diff changeset
1812 seen_non_default_actions = set()
59275
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1813
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diff changeset
1814 def take_action(action, argument_strings, option_string=None):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1815 seen_actions.add(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1816 argument_values = self._get_values(action, argument_strings)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1817
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1818 # error if this argument is not allowed with other previously
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1819 # seen arguments, assuming that actions that use the default
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1820 # value don't really count as "present"
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1821 if argument_values is not action.default:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1822 seen_non_default_actions.add(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1823 for conflict_action in action_conflicts.get(action, []):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1824 if conflict_action in seen_non_default_actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1825 msg = _('not allowed with argument %s')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1826 action_name = _get_action_name(conflict_action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1827 raise ArgumentError(action, msg % action_name)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1828
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diff changeset
1829 # take the action if we didn't receive a SUPPRESS value
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1830 # (e.g. from a default)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1831 if argument_values is not SUPPRESS:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1832 action(self, namespace, argument_values, option_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1833
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diff changeset
1834 # function to convert arg_strings into an optional action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1835 def consume_optional(start_index):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1836
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diff changeset
1837 # get the optional identified at this index
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1838 option_tuple = option_string_indices[start_index]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1839 action, option_string, explicit_arg = option_tuple
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1840
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1841 # identify additional optionals in the same arg string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1842 # (e.g. -xyz is the same as -x -y -z if no args are required)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1843 match_argument = self._match_argument
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1844 action_tuples = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1845 while True:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1846
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1847 # if we found no optional action, skip it
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1848 if action is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1849 extras.append(arg_strings[start_index])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1850 return start_index + 1
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1851
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1852 # if there is an explicit argument, try to match the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1853 # optional's string arguments to only this
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1854 if explicit_arg is not None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1855 arg_count = match_argument(action, 'A')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1856
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1857 # if the action is a single-dash option and takes no
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1858 # arguments, try to parse more single-dash options out
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1859 # of the tail of the option string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1860 chars = self.prefix_chars
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1861 if arg_count == 0 and option_string[1] not in chars:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1862 action_tuples.append((action, [], option_string))
65867
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1863 char = option_string[0]
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1864 option_string = char + explicit_arg[0]
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1865 new_explicit_arg = explicit_arg[1:] or None
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1866 optionals_map = self._option_string_actions
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1867 if option_string in optionals_map:
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1868 action = optionals_map[option_string]
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1869 explicit_arg = new_explicit_arg
59275
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1870 else:
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parents: 59258
diff changeset
1871 msg = _('ignored explicit argument %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1872 raise ArgumentError(action, msg % explicit_arg)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1873
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1874 # if the action expect exactly one argument, we've
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1875 # successfully matched the option; exit the loop
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1876 elif arg_count == 1:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1877 stop = start_index + 1
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1878 args = [explicit_arg]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1879 action_tuples.append((action, args, option_string))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1880 break
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1881
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1882 # error if a double-dash option did not use the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1883 # explicit argument
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diff changeset
1884 else:
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parents: 59258
diff changeset
1885 msg = _('ignored explicit argument %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1886 raise ArgumentError(action, msg % explicit_arg)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1887
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diff changeset
1888 # if there is no explicit argument, try to match the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1889 # optional's string arguments with the following strings
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1890 # if successful, exit the loop
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1891 else:
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parents: 59258
diff changeset
1892 start = start_index + 1
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1893 selected_patterns = arg_strings_pattern[start:]
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parents: 59258
diff changeset
1894 arg_count = match_argument(action, selected_patterns)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1895 stop = start + arg_count
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1896 args = arg_strings[start:stop]
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1897 action_tuples.append((action, args, option_string))
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diff changeset
1898 break
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1899
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diff changeset
1900 # add the Optional to the list and return the index at which
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1901 # the Optional's string args stopped
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1902 assert action_tuples
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1903 for action, args, option_string in action_tuples:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1904 take_action(action, args, option_string)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1905 return stop
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diff changeset
1906
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diff changeset
1907 # the list of Positionals left to be parsed; this is modified
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1908 # by consume_positionals()
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1909 positionals = self._get_positional_actions()
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1910
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1911 # function to convert arg_strings into positional actions
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1912 def consume_positionals(start_index):
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1913 # match as many Positionals as possible
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1914 match_partial = self._match_arguments_partial
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1915 selected_pattern = arg_strings_pattern[start_index:]
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1916 arg_counts = match_partial(positionals, selected_pattern)
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1917
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1918 # slice off the appropriate arg strings for each Positional
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1919 # and add the Positional and its args to the list
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1920 for action, arg_count in zip(positionals, arg_counts):
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1921 args = arg_strings[start_index: start_index + arg_count]
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1922 start_index += arg_count
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1923 take_action(action, args)
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1924
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1925 # slice off the Positionals that we just parsed and return the
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1926 # index at which the Positionals' string args stopped
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1927 positionals[:] = positionals[len(arg_counts):]
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1928 return start_index
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1929
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1930 # consume Positionals and Optionals alternately, until we have
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1931 # passed the last option string
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1932 extras = []
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1933 start_index = 0
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1934 if option_string_indices:
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1935 max_option_string_index = max(option_string_indices)
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1936 else:
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1937 max_option_string_index = -1
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1938 while start_index <= max_option_string_index:
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1939
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1940 # consume any Positionals preceding the next option
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1941 next_option_string_index = min([
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1942 index
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1943 for index in option_string_indices
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1944 if index >= start_index])
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1945 if start_index != next_option_string_index:
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1946 positionals_end_index = consume_positionals(start_index)
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1947
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1948 # only try to parse the next optional if we didn't consume
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1949 # the option string during the positionals parsing
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1950 if positionals_end_index > start_index:
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1951 start_index = positionals_end_index
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1952 continue
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1953 else:
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1954 start_index = positionals_end_index
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1955
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1956 # if we consumed all the positionals we could and we're not
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1957 # at the index of an option string, there were extra arguments
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1958 if start_index not in option_string_indices:
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1959 strings = arg_strings[start_index:next_option_string_index]
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1960 extras.extend(strings)
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1961 start_index = next_option_string_index
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1962
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1963 # consume the next optional and any arguments for it
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1964 start_index = consume_optional(start_index)
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1965
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1966 # consume any positionals following the last Optional
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1967 stop_index = consume_positionals(start_index)
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1968
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1969 # if we didn't consume all the argument strings, there were extras
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1970 extras.extend(arg_strings[stop_index:])
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1971
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1972 # make sure all required actions were present
70741
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1973 required_actions = [_get_action_name(action) for action in self._actions
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1974 if action.required and action not in seen_actions]
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1975 if required_actions:
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1976 self.error(_('the following arguments are required: %s') %
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1977 ', '.join(required_actions))
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1978
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1979 # make sure all required groups had one option present
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1980 for group in self._mutually_exclusive_groups:
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1981 if group.required:
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1982 for action in group._group_actions:
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1983 if action in seen_non_default_actions:
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1984 break
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1985
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1986 # if no actions were used, report the error
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1987 else:
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1988 names = [_get_action_name(action)
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1989 for action in group._group_actions
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1990 if action.help is not SUPPRESS]
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1991 msg = _('one of the arguments %s is required')
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1992 self.error(msg % ' '.join(names))
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1993
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1994 # return the updated namespace and the extra arguments
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1995 return namespace, extras
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1996
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1997 def _read_args_from_files(self, arg_strings):
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1998 # expand arguments referencing files
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1999 new_arg_strings = []
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2000 for arg_string in arg_strings:
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2001
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2002 # for regular arguments, just add them back into the list
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2003 if arg_string[0] not in self.fromfile_prefix_chars:
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2004 new_arg_strings.append(arg_string)
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2005
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2006 # replace arguments referencing files with the file content
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2007 else:
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2008 try:
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2009 args_file = open(arg_string[1:])
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2010 try:
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2011 arg_strings = []
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2012 for arg_line in args_file.read().splitlines():
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2013 for arg in self.convert_arg_line_to_args(arg_line):
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2014 arg_strings.append(arg)
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2015 arg_strings = self._read_args_from_files(arg_strings)
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2016 new_arg_strings.extend(arg_strings)
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2017 finally:
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2018 args_file.close()
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2019 except IOError:
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2020 err = _sys.exc_info()[1]
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2021 self.error(str(err))
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2022
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2023 # return the modified argument list
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2024 return new_arg_strings
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2025
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2026 def convert_arg_line_to_args(self, arg_line):
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2027 return [arg_line]
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2028
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2029 def _match_argument(self, action, arg_strings_pattern):
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2030 # match the pattern for this action to the arg strings
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2031 nargs_pattern = self._get_nargs_pattern(action)
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2032 match = _re.match(nargs_pattern, arg_strings_pattern)
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2033
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2034 # raise an exception if we weren't able to find a match
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2035 if match is None:
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2036 nargs_errors = {
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2037 None: _('expected one argument'),
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2038 OPTIONAL: _('expected at most one argument'),
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2039 ONE_OR_MORE: _('expected at least one argument'),
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2040 }
66721
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
2041 default = ngettext('expected %s argument',
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Éric Araujo <merwok@netwok.org>
parents: 66661
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2042 'expected %s arguments',
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2043 action.nargs) % action.nargs
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diff changeset
2044 msg = nargs_errors.get(action.nargs, default)
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diff changeset
2045 raise ArgumentError(action, msg)
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diff changeset
2046
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diff changeset
2047 # return the number of arguments matched
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diff changeset
2048 return len(match.group(1))
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diff changeset
2049
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diff changeset
2050 def _match_arguments_partial(self, actions, arg_strings_pattern):
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diff changeset
2051 # progressively shorten the actions list by slicing off the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2052 # final actions until we find a match
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diff changeset
2053 result = []
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parents: 59258
diff changeset
2054 for i in range(len(actions), 0, -1):
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parents: 59258
diff changeset
2055 actions_slice = actions[:i]
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diff changeset
2056 pattern = ''.join([self._get_nargs_pattern(action)
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parents: 59258
diff changeset
2057 for action in actions_slice])
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parents: 59258
diff changeset
2058 match = _re.match(pattern, arg_strings_pattern)
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diff changeset
2059 if match is not None:
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diff changeset
2060 result.extend([len(string) for string in match.groups()])
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diff changeset
2061 break
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diff changeset
2062
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diff changeset
2063 # return the list of arg string counts
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parents: 59258
diff changeset
2064 return result
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diff changeset
2065
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diff changeset
2066 def _parse_optional(self, arg_string):
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diff changeset
2067 # if it's an empty string, it was meant to be a positional
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diff changeset
2068 if not arg_string:
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diff changeset
2069 return None
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diff changeset
2070
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diff changeset
2071 # if it doesn't start with a prefix, it was meant to be positional
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diff changeset
2072 if not arg_string[0] in self.prefix_chars:
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diff changeset
2073 return None
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diff changeset
2074
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diff changeset
2075 # if the option string is present in the parser, return the action
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diff changeset
2076 if arg_string in self._option_string_actions:
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diff changeset
2077 action = self._option_string_actions[arg_string]
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diff changeset
2078 return action, arg_string, None
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diff changeset
2079
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diff changeset
2080 # if it's just a single character, it was meant to be positional
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diff changeset
2081 if len(arg_string) == 1:
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diff changeset
2082 return None
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diff changeset
2083
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diff changeset
2084 # if the option string before the "=" is present, return the action
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diff changeset
2085 if '=' in arg_string:
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diff changeset
2086 option_string, explicit_arg = arg_string.split('=', 1)
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parents: 59258
diff changeset
2087 if option_string in self._option_string_actions:
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diff changeset
2088 action = self._option_string_actions[option_string]
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diff changeset
2089 return action, option_string, explicit_arg
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diff changeset
2090
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diff changeset
2091 # search through all possible prefixes of the option string
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diff changeset
2092 # and all actions in the parser for possible interpretations
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diff changeset
2093 option_tuples = self._get_option_tuples(arg_string)
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diff changeset
2094
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diff changeset
2095 # if multiple actions match, the option string was ambiguous
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parents: 59258
diff changeset
2096 if len(option_tuples) > 1:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
2097 options = ', '.join([option_string
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diff changeset
2098 for action, option_string, explicit_arg in option_tuples])
66661
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
2099 args = {'option': arg_string, 'matches': options}
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
2100 msg = _('ambiguous option: %(option)s could match %(matches)s')
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
2101 self.error(msg % args)
59275
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diff changeset
2102
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diff changeset
2103 # if exactly one action matched, this segmentation is good,
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parents: 59258
diff changeset
2104 # so return the parsed action
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parents: 59258
diff changeset
2105 elif len(option_tuples) == 1:
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parents: 59258
diff changeset
2106 option_tuple, = option_tuples
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parents: 59258
diff changeset
2107 return option_tuple
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diff changeset
2108
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parents: 59258
diff changeset
2109 # if it was not found as an option, but it looks like a negative
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diff changeset
2110 # number, it was meant to be positional
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parents: 59258
diff changeset
2111 # unless there are negative-number-like options
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diff changeset
2112 if self._negative_number_matcher.match(arg_string):
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diff changeset
2113 if not self._has_negative_number_optionals:
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diff changeset
2114 return None
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diff changeset
2115
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diff changeset
2116 # if it contains a space, it was meant to be a positional
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diff changeset
2117 if ' ' in arg_string:
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diff changeset
2118 return None
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diff changeset
2119
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diff changeset
2120 # it was meant to be an optional but there is no such option
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parents: 59258
diff changeset
2121 # in this parser (though it might be a valid option in a subparser)
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diff changeset
2122 return None, arg_string, None
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diff changeset
2123
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diff changeset
2124 def _get_option_tuples(self, option_string):
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diff changeset
2125 result = []
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diff changeset
2126
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diff changeset
2127 # option strings starting with two prefix characters are only
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diff changeset
2128 # split at the '='
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diff changeset
2129 chars = self.prefix_chars
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diff changeset
2130 if option_string[0] in chars and option_string[1] in chars:
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diff changeset
2131 if '=' in option_string:
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diff changeset
2132 option_prefix, explicit_arg = option_string.split('=', 1)
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diff changeset
2133 else:
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diff changeset
2134 option_prefix = option_string
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diff changeset
2135 explicit_arg = None
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diff changeset
2136 for option_string in self._option_string_actions:
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parents: 59258
diff changeset
2137 if option_string.startswith(option_prefix):
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diff changeset
2138 action = self._option_string_actions[option_string]
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diff changeset
2139 tup = action, option_string, explicit_arg
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diff changeset
2140 result.append(tup)
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diff changeset
2141
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diff changeset
2142 # single character options can be concatenated with their arguments
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2143 # but multiple character options always have to have their argument
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diff changeset
2144 # separate
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diff changeset
2145 elif option_string[0] in chars and option_string[1] not in chars:
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diff changeset
2146 option_prefix = option_string
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diff changeset
2147 explicit_arg = None
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diff changeset
2148 short_option_prefix = option_string[:2]
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diff changeset
2149 short_explicit_arg = option_string[2:]
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diff changeset
2150
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diff changeset
2151 for option_string in self._option_string_actions:
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diff changeset
2152 if option_string == short_option_prefix:
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diff changeset
2153 action = self._option_string_actions[option_string]
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diff changeset
2154 tup = action, option_string, short_explicit_arg
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diff changeset
2155 result.append(tup)
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diff changeset
2156 elif option_string.startswith(option_prefix):
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diff changeset
2157 action = self._option_string_actions[option_string]
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diff changeset
2158 tup = action, option_string, explicit_arg
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diff changeset
2159 result.append(tup)
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diff changeset
2160
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diff changeset
2161 # shouldn't ever get here
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diff changeset
2162 else:
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diff changeset
2163 self.error(_('unexpected option string: %s') % option_string)
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diff changeset
2164
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diff changeset
2165 # return the collected option tuples
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diff changeset
2166 return result
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diff changeset
2167
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diff changeset
2168 def _get_nargs_pattern(self, action):
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diff changeset
2169 # in all examples below, we have to allow for '--' args
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diff changeset
2170 # which are represented as '-' in the pattern
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diff changeset
2171 nargs = action.nargs
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diff changeset
2172
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diff changeset
2173 # the default (None) is assumed to be a single argument
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diff changeset
2174 if nargs is None:
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diff changeset
2175 nargs_pattern = '(-*A-*)'
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diff changeset
2176
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diff changeset
2177 # allow zero or one arguments
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diff changeset
2178 elif nargs == OPTIONAL:
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diff changeset
2179 nargs_pattern = '(-*A?-*)'
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diff changeset
2180
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diff changeset
2181 # allow zero or more arguments
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diff changeset
2182 elif nargs == ZERO_OR_MORE:
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diff changeset
2183 nargs_pattern = '(-*[A-]*)'
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diff changeset
2184
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diff changeset
2185 # allow one or more arguments
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diff changeset
2186 elif nargs == ONE_OR_MORE:
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diff changeset
2187 nargs_pattern = '(-*A[A-]*)'
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diff changeset
2188
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diff changeset
2189 # allow any number of options or arguments
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diff changeset
2190 elif nargs == REMAINDER:
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diff changeset
2191 nargs_pattern = '([-AO]*)'
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diff changeset
2192
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diff changeset
2193 # allow one argument followed by any number of options or arguments
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diff changeset
2194 elif nargs == PARSER:
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diff changeset
2195 nargs_pattern = '(-*A[-AO]*)'
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diff changeset
2196
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diff changeset
2197 # all others should be integers
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diff changeset
2198 else:
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diff changeset
2199 nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
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diff changeset
2200
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diff changeset
2201 # if this is an optional action, -- is not allowed
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diff changeset
2202 if action.option_strings:
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diff changeset
2203 nargs_pattern = nargs_pattern.replace('-*', '')
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diff changeset
2204 nargs_pattern = nargs_pattern.replace('-', '')
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diff changeset
2205
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diff changeset
2206 # return the pattern
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diff changeset
2207 return nargs_pattern
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diff changeset
2208
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diff changeset
2209 # ========================
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2210 # Value conversion methods
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2211 # ========================
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2212 def _get_values(self, action, arg_strings):
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diff changeset
2213 # for everything but PARSER args, strip out '--'
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diff changeset
2214 if action.nargs not in [PARSER, REMAINDER]:
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diff changeset
2215 arg_strings = [s for s in arg_strings if s != '--']
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diff changeset
2216
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2217 # optional argument produces a default when not present
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diff changeset
2218 if not arg_strings and action.nargs == OPTIONAL:
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diff changeset
2219 if action.option_strings:
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diff changeset
2220 value = action.const
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diff changeset
2221 else:
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2222 value = action.default
59282
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diff changeset
2223 if isinstance(value, str):
59275
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diff changeset
2224 value = self._get_value(action, value)
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diff changeset
2225 self._check_value(action, value)
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diff changeset
2226
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diff changeset
2227 # when nargs='*' on a positional, if there were no command-line
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diff changeset
2228 # args, use the default if it is anything other than None
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diff changeset
2229 elif (not arg_strings and action.nargs == ZERO_OR_MORE and
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diff changeset
2230 not action.option_strings):
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diff changeset
2231 if action.default is not None:
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diff changeset
2232 value = action.default
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diff changeset
2233 else:
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diff changeset
2234 value = arg_strings
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diff changeset
2235 self._check_value(action, value)
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diff changeset
2236
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diff changeset
2237 # single argument or optional argument produces a single value
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diff changeset
2238 elif len(arg_strings) == 1 and action.nargs in [None, OPTIONAL]:
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diff changeset
2239 arg_string, = arg_strings
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diff changeset
2240 value = self._get_value(action, arg_string)
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diff changeset
2241 self._check_value(action, value)
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diff changeset
2242
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diff changeset
2243 # REMAINDER arguments convert all values, checking none
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diff changeset
2244 elif action.nargs == REMAINDER:
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diff changeset
2245 value = [self._get_value(action, v) for v in arg_strings]
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diff changeset
2246
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diff changeset
2247 # PARSER arguments convert all values, but check only the first
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diff changeset
2248 elif action.nargs == PARSER:
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diff changeset
2249 value = [self._get_value(action, v) for v in arg_strings]
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diff changeset
2250 self._check_value(action, value[0])
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diff changeset
2251
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diff changeset
2252 # all other types of nargs produce a list
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diff changeset
2253 else:
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diff changeset
2254 value = [self._get_value(action, v) for v in arg_strings]
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diff changeset
2255 for v in value:
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diff changeset
2256 self._check_value(action, v)
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diff changeset
2257
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diff changeset
2258 # return the converted value
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diff changeset
2259 return value
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diff changeset
2260
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diff changeset
2261 def _get_value(self, action, arg_string):
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diff changeset
2262 type_func = self._registry_get('type', action.type, action.type)
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diff changeset
2263 if not _callable(type_func):
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diff changeset
2264 msg = _('%r is not callable')
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diff changeset
2265 raise ArgumentError(action, msg % type_func)
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diff changeset
2266
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diff changeset
2267 # convert the value to the appropriate type
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diff changeset
2268 try:
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diff changeset
2269 result = type_func(arg_string)
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diff changeset
2270
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diff changeset
2271 # ArgumentTypeErrors indicate errors
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diff changeset
2272 except ArgumentTypeError:
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diff changeset
2273 name = getattr(action.type, '__name__', repr(action.type))
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diff changeset
2274 msg = str(_sys.exc_info()[1])
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diff changeset
2275 raise ArgumentError(action, msg)
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diff changeset
2276
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diff changeset
2277 # TypeErrors or ValueErrors also indicate errors
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diff changeset
2278 except (TypeError, ValueError):
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diff changeset
2279 name = getattr(action.type, '__name__', repr(action.type))
66661
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diff changeset
2280 args = {'type': name, 'value': arg_string}
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diff changeset
2281 msg = _('invalid %(type)s value: %(value)r')
4c9844732925 Allow translators to reorder placeholders in localizable messages from
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diff changeset
2282 raise ArgumentError(action, msg % args)
59275
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diff changeset
2283
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diff changeset
2284 # return the converted value
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diff changeset
2285 return result
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diff changeset
2286
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diff changeset
2287 def _check_value(self, action, value):
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diff changeset
2288 # converted value must be one of the choices (if specified)
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diff changeset
2289 if action.choices is not None and value not in action.choices:
66661
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diff changeset
2290 args = {'value': value,
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diff changeset
2291 'choices': ', '.join(map(repr, action.choices))}
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diff changeset
2292 msg = _('invalid choice: %(value)r (choose from %(choices)s)')
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diff changeset
2293 raise ArgumentError(action, msg % args)
59275
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diff changeset
2294
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diff changeset
2295 # =======================
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diff changeset
2296 # Help-formatting methods
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diff changeset
2297 # =======================
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diff changeset
2298 def format_usage(self):
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diff changeset
2299 formatter = self._get_formatter()
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diff changeset
2300 formatter.add_usage(self.usage, self._actions,
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diff changeset
2301 self._mutually_exclusive_groups)
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diff changeset
2302 return formatter.format_help()
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diff changeset
2303
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diff changeset
2304 def format_help(self):
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diff changeset
2305 formatter = self._get_formatter()
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diff changeset
2306
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diff changeset
2307 # usage
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diff changeset
2308 formatter.add_usage(self.usage, self._actions,
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diff changeset
2309 self._mutually_exclusive_groups)
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diff changeset
2310
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diff changeset
2311 # description
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diff changeset
2312 formatter.add_text(self.description)
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2313
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2314 # positionals, optionals and user-defined groups
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2315 for action_group in self._action_groups:
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2316 formatter.start_section(action_group.title)
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2317 formatter.add_text(action_group.description)
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2318 formatter.add_arguments(action_group._group_actions)
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2319 formatter.end_section()
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2320
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2321 # epilog
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2322 formatter.add_text(self.epilog)
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2323
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2324 # determine help from format above
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2325 return formatter.format_help()
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2326
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2327 def format_version(self):
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2328 import warnings
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2329 warnings.warn(
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2330 'The format_version method is deprecated -- the "version" '
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2331 'argument to ArgumentParser is no longer supported.',
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2332 DeprecationWarning)
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2333 formatter = self._get_formatter()
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2334 formatter.add_text(self.version)
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2335 return formatter.format_help()
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2336
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2337 def _get_formatter(self):
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2338 return self.formatter_class(prog=self.prog)
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2339
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2340 # =====================
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2341 # Help-printing methods
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2342 # =====================
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2343 def print_usage(self, file=None):
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2344 if file is None:
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2345 file = _sys.stdout
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2346 self._print_message(self.format_usage(), file)
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2347
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2348 def print_help(self, file=None):
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2349 if file is None:
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2350 file = _sys.stdout
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2351 self._print_message(self.format_help(), file)
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2352
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2353 def print_version(self, file=None):
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2354 import warnings
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2355 warnings.warn(
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2356 'The print_version method is deprecated -- the "version" '
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2357 'argument to ArgumentParser is no longer supported.',
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2358 DeprecationWarning)
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2359 self._print_message(self.format_version(), file)
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2360
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2361 def _print_message(self, message, file=None):
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2362 if message:
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2363 if file is None:
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2364 file = _sys.stderr
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2365 file.write(message)
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2366
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2367 # ===============
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2368 # Exiting methods
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2369 # ===============
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2370 def exit(self, status=0, message=None):
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2371 if message:
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2372 self._print_message(message, _sys.stderr)
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2373 _sys.exit(status)
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2374
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2375 def error(self, message):
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2376 """error(message: string)
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2377
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2378 Prints a usage message incorporating the message to stderr and
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2379 exits.
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2380
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2381 If you override this in a subclass, it should not return -- it
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2382 should either exit or raise an exception.
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2383 """
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2384 self.print_usage(_sys.stderr)
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2385 args = {'prog': self.prog, 'message': message}
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2386 self.exit(2, _('%(prog)s: error: %(message)s\n') % args)