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annotate Lib/pprint.py @ 83983:ccffce2dde49

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Issue #18084: Use sys.byteorder in wave.py. Original patch by Hideaki Takahashi.
author Serhiy Storchaka <storchaka@gmail.com>
date Wed, 29 May 2013 23:38:00 +0300
parents 5a2296093645
children 2d21239a5205
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1 # Author: Fred L. Drake, Jr.
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2 # fdrake@acm.org
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3 #
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4 # This is a simple little module I wrote to make life easier. I didn't
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5 # see anything quite like it in the library, though I may have overlooked
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6 # something. I wrote this when I was trying to read some heavily nested
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7 # tuples with fairly non-descriptive content. This is modeled very much
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8 # after Lisp/Scheme - style pretty-printing of lists. If you find it
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9 # useful, thank small children who sleep at night.
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10
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11 """Support to pretty-print lists, tuples, & dictionaries recursively.
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12
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13 Very simple, but useful, especially in debugging data structures.
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14
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15 Classes
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16 -------
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17
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18 PrettyPrinter()
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19 Handle pretty-printing operations onto a stream using a configured
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20 set of formatting parameters.
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21
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22 Functions
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23 ---------
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24
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25 pformat()
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26 Format a Python object into a pretty-printed representation.
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27
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28 pprint()
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29 Pretty-print a Python object to a stream [default is sys.stdout].
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30
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31 saferepr()
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32 Generate a 'standard' repr()-like value, but protect against recursive
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33 data structures.
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34
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35 """
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36
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37 import re
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38 import sys as _sys
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39 from collections import OrderedDict as _OrderedDict
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40 from io import StringIO as _StringIO
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41
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42 __all__ = ["pprint","pformat","isreadable","isrecursive","saferepr",
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43 "PrettyPrinter"]
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44
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45 # cache these for faster access:
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46 _commajoin = ", ".join
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47 _id = id
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48 _len = len
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49 _type = type
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51
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52 def pprint(object, stream=None, indent=1, width=80, depth=None):
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53 """Pretty-print a Python object to a stream [default is sys.stdout]."""
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54 printer = PrettyPrinter(
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55 stream=stream, indent=indent, width=width, depth=depth)
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56 printer.pprint(object)
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57
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58 def pformat(object, indent=1, width=80, depth=None):
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59 """Format a Python object into a pretty-printed representation."""
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60 return PrettyPrinter(indent=indent, width=width, depth=depth).pformat(object)
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61
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62 def saferepr(object):
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63 """Version of repr() which can handle recursive data structures."""
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64 return _safe_repr(object, {}, None, 0)[0]
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65
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66 def isreadable(object):
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67 """Determine if saferepr(object) is readable by eval()."""
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68 return _safe_repr(object, {}, None, 0)[1]
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69
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70 def isrecursive(object):
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71 """Determine if object requires a recursive representation."""
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72 return _safe_repr(object, {}, None, 0)[2]
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73
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74 class _safe_key:
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75 """Helper function for key functions when sorting unorderable objects.
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76
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77 The wrapped-object will fallback to an Py2.x style comparison for
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78 unorderable types (sorting first comparing the type name and then by
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79 the obj ids). Does not work recursively, so dict.items() must have
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80 _safe_key applied to both the key and the value.
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81
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82 """
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83
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84 __slots__ = ['obj']
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85
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86 def __init__(self, obj):
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87 self.obj = obj
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88
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89 def __lt__(self, other):
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90 try:
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91 rv = self.obj.__lt__(other.obj)
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92 except TypeError:
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93 rv = NotImplemented
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94
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95 if rv is NotImplemented:
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96 rv = (str(type(self.obj)), id(self.obj)) < \
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97 (str(type(other.obj)), id(other.obj))
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98 return rv
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99
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100 def _safe_tuple(t):
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101 "Helper function for comparing 2-tuples"
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102 return _safe_key(t[0]), _safe_key(t[1])
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103
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104 class PrettyPrinter:
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105 def __init__(self, indent=1, width=80, depth=None, stream=None):
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106 """Handle pretty printing operations onto a stream using a set of
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107 configured parameters.
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108
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109 indent
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110 Number of spaces to indent for each level of nesting.
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111
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112 width
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113 Attempted maximum number of columns in the output.
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114
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115 depth
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116 The maximum depth to print out nested structures.
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117
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118 stream
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119 The desired output stream. If omitted (or false), the standard
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120 output stream available at construction will be used.
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121
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122 """
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123 indent = int(indent)
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124 width = int(width)
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125 assert indent >= 0, "indent must be >= 0"
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126 assert depth is None or depth > 0, "depth must be > 0"
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127 assert width, "width must be != 0"
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128 self._depth = depth
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129 self._indent_per_level = indent
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130 self._width = width
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131 if stream is not None:
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132 self._stream = stream
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133 else:
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134 self._stream = _sys.stdout
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135
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136 def pprint(self, object):
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137 self._format(object, self._stream, 0, 0, {}, 0)
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138 self._stream.write("\n")
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139
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140 def pformat(self, object):
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141 sio = _StringIO()
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142 self._format(object, sio, 0, 0, {}, 0)
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143 return sio.getvalue()
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144
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145 def isrecursive(self, object):
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146 return self.format(object, {}, 0, 0)[2]
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147
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148 def isreadable(self, object):
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149 s, readable, recursive = self.format(object, {}, 0, 0)
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150 return readable and not recursive
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151
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152 def _format(self, object, stream, indent, allowance, context, level):
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153 level = level + 1
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154 objid = _id(object)
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155 if objid in context:
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156 stream.write(_recursion(object))
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157 self._recursive = True
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158 self._readable = False
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159 return
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160 rep = self._repr(object, context, level - 1)
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161 typ = _type(object)
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162 max_width = self._width - 1 - indent - allowance
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163 sepLines = _len(rep) > max_width
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164 write = stream.write
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165
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166 if sepLines:
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167 r = getattr(typ, "__repr__", None)
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168 if issubclass(typ, dict):
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169 write('{')
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170 if self._indent_per_level > 1:
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171 write((self._indent_per_level - 1) * ' ')
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172 length = _len(object)
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173 if length:
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174 context[objid] = 1
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175 indent = indent + self._indent_per_level
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176 if issubclass(typ, _OrderedDict):
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177 items = list(object.items())
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178 else:
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179 items = sorted(object.items(), key=_safe_tuple)
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180 key, ent = items[0]
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181 rep = self._repr(key, context, level)
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182 write(rep)
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183 write(': ')
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184 self._format(ent, stream, indent + _len(rep) + 2,
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185 allowance + 1, context, level)
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186 if length > 1:
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187 for key, ent in items[1:]:
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188 rep = self._repr(key, context, level)
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189 write(',\n%s%s: ' % (' '*indent, rep))
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190 self._format(ent, stream, indent + _len(rep) + 2,
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191 allowance + 1, context, level)
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192 indent = indent - self._indent_per_level
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193 del context[objid]
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194 write('}')
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195 return
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196
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197 if ((issubclass(typ, list) and r is list.__repr__) or
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198 (issubclass(typ, tuple) and r is tuple.__repr__) or
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199 (issubclass(typ, set) and r is set.__repr__) or
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200 (issubclass(typ, frozenset) and r is frozenset.__repr__)
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201 ):
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202 length = _len(object)
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203 if issubclass(typ, list):
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204 write('[')
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205 endchar = ']'
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206 elif issubclass(typ, set):
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207 if not length:
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208 write('set()')
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209 return
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210 write('{')
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211 endchar = '}'
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212 object = sorted(object, key=_safe_key)
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213 elif issubclass(typ, frozenset):
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214 if not length:
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215 write('frozenset()')
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216 return
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217 write('frozenset({')
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218 endchar = '})'
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219 object = sorted(object, key=_safe_key)
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220 indent += 10
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221 else:
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222 write('(')
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223 endchar = ')'
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224 if self._indent_per_level > 1:
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225 write((self._indent_per_level - 1) * ' ')
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226 if length:
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227 context[objid] = 1
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228 indent = indent + self._indent_per_level
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229 self._format(object[0], stream, indent, allowance + 1,
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230 context, level)
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231 if length > 1:
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232 for ent in object[1:]:
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233 write(',\n' + ' '*indent)
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234 self._format(ent, stream, indent,
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235 allowance + 1, context, level)
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236 indent = indent - self._indent_per_level
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237 del context[objid]
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238 if issubclass(typ, tuple) and length == 1:
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239 write(',')
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240 write(endchar)
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241 return
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242
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243 if issubclass(typ, str) and len(object) > 0 and r is str.__repr__:
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244 def _str_parts(s):
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245 """
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246 Return a list of string literals comprising the repr()
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247 of the given string using literal concatenation.
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248 """
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249 lines = s.splitlines(True)
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250 for i, line in enumerate(lines):
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251 rep = repr(line)
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252 if _len(rep) <= max_width:
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253 yield rep
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254 else:
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255 # A list of alternating (non-space, space) strings
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parents: 78212
diff changeset
256 parts = re.split(r'(\s+)', line) + ['']
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
257 current = ''
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
258 for i in range(0, len(parts), 2):
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
259 part = parts[i] + parts[i+1]
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
260 candidate = current + part
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
261 if len(repr(candidate)) > max_width:
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
262 if current:
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
263 yield repr(current)
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
264 current = part
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
265 else:
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
266 current = candidate
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
267 if current:
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
268 yield repr(current)
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
269 for i, rep in enumerate(_str_parts(object)):
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
270 if i > 0:
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
271 write('\n' + ' '*indent)
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
272 write(rep)
5a2296093645 Issue #17150: pprint now uses line continuations to wrap long string literals.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78212
diff changeset
273 return
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
274 write(rep)
5330
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Guido van Rossum <guido@python.org>
parents:
diff changeset
275
24131
e5ecef5a123a Change the "__ private" names to "_ protected"; this has been a pain for
Fred Drake <fdrake@acm.org>
parents: 23622
diff changeset
276 def _repr(self, object, context, level):
22766
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Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
277 repr, readable, recursive = self.format(object, context.copy(),
24131
e5ecef5a123a Change the "__ private" names to "_ protected"; this has been a pain for
Fred Drake <fdrake@acm.org>
parents: 23622
diff changeset
278 self._depth, level)
7755
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 6312
diff changeset
279 if not readable:
24131
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Fred Drake <fdrake@acm.org>
parents: 23622
diff changeset
280 self._readable = False
17820
4bcf88e4abff SF bug[ #423781: pprint.isrecursive() broken.
Tim Peters <tim.peters@gmail.com>
parents: 16562
diff changeset
281 if recursive:
24131
e5ecef5a123a Change the "__ private" names to "_ protected"; this has been a pain for
Fred Drake <fdrake@acm.org>
parents: 23622
diff changeset
282 self._recursive = True
7755
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 6312
diff changeset
283 return repr
5330
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Guido van Rossum <guido@python.org>
parents:
diff changeset
284
22766
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Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
285 def format(self, object, context, maxlevels, level):
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
286 """Format object for a specific context, returning a string
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
287 and flags indicating whether the representation is 'readable'
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
288 and whether the object represents a recursive construct.
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
289 """
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
290 return _safe_repr(object, context, maxlevels, level)
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
291
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
292
17820
4bcf88e4abff SF bug[ #423781: pprint.isrecursive() broken.
Tim Peters <tim.peters@gmail.com>
parents: 16562
diff changeset
293 # Return triple (repr_string, isreadable, isrecursive).
5330
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Guido van Rossum <guido@python.org>
parents:
diff changeset
294
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
295 def _safe_repr(object, context, maxlevels, level):
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
296 typ = _type(object)
29379
347e7b6dfd53 Revert 1.25, as overloaded __repr__ is not considered.
Martin v. Löwis <martin@v.loewis.de>
parents: 29378
diff changeset
297 if typ is str:
26929
ffa4ab37036f - PrettyPrinter.isreadable(), .isrecursive():
Fred Drake <fdrake@acm.org>
parents: 24131
diff changeset
298 if 'locale' not in _sys.modules:
31515
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Walter Dörwald <walter@livinglogic.de>
parents: 31085
diff changeset
299 return repr(object), True, False
19697
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
300 if "'" in object and '"' not in object:
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
301 closure = '"'
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
302 quotes = {'"': '\\"'}
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
303 else:
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
304 closure = "'"
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
305 quotes = {"'": "\\'"}
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
306 qget = quotes.get
26929
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Fred Drake <fdrake@acm.org>
parents: 24131
diff changeset
307 sio = _StringIO()
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
308 write = sio.write
19697
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
309 for char in object:
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
310 if char.isalpha():
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
311 write(char)
19697
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
312 else:
31515
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Walter Dörwald <walter@livinglogic.de>
parents: 31085
diff changeset
313 write(qget(char, repr(char)[1:-1]))
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
314 return ("%s%s%s" % (closure, sio.getvalue(), closure)), True, False
17828
26745053f840 pprint's workhorse _safe_repr() function took time quadratic in the # of
Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
315
33993
6771e1840bbc Fix pprint to be able to handle objects that don't have a __repr__
Walter Dörwald <walter@livinglogic.de>
parents: 32107
diff changeset
316 r = getattr(typ, "__repr__", None)
31084
e3025fe70d8b Patch #750542: pprint now will pretty print subclasses of list, tuple
Walter Dörwald <walter@livinglogic.de>
parents: 29379
diff changeset
317 if issubclass(typ, dict) and r is dict.__repr__:
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
318 if not object:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
319 return "{}", True, False
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
320 objid = _id(object)
47080
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Alexandre Vassalotti <alexandre@peadrop.com>
parents: 45067
diff changeset
321 if maxlevels and level >= maxlevels:
22867
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Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
322 return "{...}", False, objid in context
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
323 if objid in context:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
324 return _recursion(object), False, True
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
325 context[objid] = 1
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
326 readable = True
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
327 recursive = False
17828
26745053f840 pprint's workhorse _safe_repr() function took time quadratic in the # of
Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
328 components = []
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
329 append = components.append
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
330 level += 1
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
331 saferepr = _safe_repr
57340
b31a33c36f08 Issue 3976: fix pprint for sets, frozensets, and dicts containing unorderable types.
Raymond Hettinger <python@rcn.com>
parents: 47080
diff changeset
332 items = sorted(object.items(), key=_safe_tuple)
39644
13d5e5f0e993 Restructure comparison dramatically. There is no longer a default
Guido van Rossum <guido@python.org>
parents: 38546
diff changeset
333 for k, v in items:
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
334 krepr, kreadable, krecur = saferepr(k, context, maxlevels, level)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
335 vrepr, vreadable, vrecur = saferepr(v, context, maxlevels, level)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
336 append("%s: %s" % (krepr, vrepr))
7755
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 6312
diff changeset
337 readable = readable and kreadable and vreadable
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
338 if krecur or vrecur:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
339 recursive = True
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
340 del context[objid]
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
341 return "{%s}" % _commajoin(components), readable, recursive
17828
26745053f840 pprint's workhorse _safe_repr() function took time quadratic in the # of
Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
342
31084
e3025fe70d8b Patch #750542: pprint now will pretty print subclasses of list, tuple
Walter Dörwald <walter@livinglogic.de>
parents: 29379
diff changeset
343 if (issubclass(typ, list) and r is list.__repr__) or \
e3025fe70d8b Patch #750542: pprint now will pretty print subclasses of list, tuple
Walter Dörwald <walter@livinglogic.de>
parents: 29379
diff changeset
344 (issubclass(typ, tuple) and r is tuple.__repr__):
e3025fe70d8b Patch #750542: pprint now will pretty print subclasses of list, tuple
Walter Dörwald <walter@livinglogic.de>
parents: 29379
diff changeset
345 if issubclass(typ, list):
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
346 if not object:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
347 return "[]", True, False
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
348 format = "[%s]"
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
349 elif _len(object) == 1:
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
350 format = "(%s,)"
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
351 else:
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
352 if not object:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
353 return "()", True, False
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
354 format = "(%s)"
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
355 objid = _id(object)
47080
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Alexandre Vassalotti <alexandre@peadrop.com>
parents: 45067
diff changeset
356 if maxlevels and level >= maxlevels:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
357 return format % "...", False, objid in context
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
358 if objid in context:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
359 return _recursion(object), False, True
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
360 context[objid] = 1
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
361 readable = True
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
362 recursive = False
17828
26745053f840 pprint's workhorse _safe_repr() function took time quadratic in the # of
Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
363 components = []
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
364 append = components.append
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
365 level += 1
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
366 for o in object:
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
367 orepr, oreadable, orecur = _safe_repr(o, context, maxlevels, level)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
368 append(orepr)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
369 if not oreadable:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
370 readable = False
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
371 if orecur:
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
372 recursive = True
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
373 del context[objid]
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
374 return format % _commajoin(components), readable, recursive
20967
bb8716095a81 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 20819
diff changeset
375
31515
71a294bd7950 Replace backticks with repr() or "%r"
Walter Dörwald <walter@livinglogic.de>
parents: 31085
diff changeset
376 rep = repr(object)
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
377 return rep, (rep and not rep.startswith('<')), False
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
378
17828
26745053f840 pprint's workhorse _safe_repr() function took time quadratic in the # of
Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
379
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
380 def _recursion(object):
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
381 return ("<Recursion on %s with id=%s>"
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
382 % (_type(object).__name__, _id(object)))
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
383
5330
5a22f9b38aac Checking in a copy of Fred Drake's data structure pretty-printer
Guido van Rossum <guido@python.org>
parents:
diff changeset
384
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
385 def _perfcheck(object=None):
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
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386 import time
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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387 if object is None:
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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388 object = [("string", (1, 2), [3, 4], {5: 6, 7: 8})] * 100000
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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389 p = PrettyPrinter()
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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390 t1 = time.time()
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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391 _safe_repr(object, {}, None, 0)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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392 t2 = time.time()
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
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393 p.pformat(object)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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394 t3 = time.time()
40775
4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
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395 print("_safe_repr:", t2 - t1)
4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
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396 print("pformat:", t3 - t2)
5330
5a22f9b38aac Checking in a copy of Fred Drake's data structure pretty-printer
Guido van Rossum <guido@python.org>
parents:
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397
20819
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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398 if __name__ == "__main__":
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
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399 _perfcheck()