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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents f1fc947722f2
children 128dd6de134c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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913eb31b0317 Moved compile_command() to a file of its own (codeop.py).
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1 """Utilities needed to emulate Python's interactive interpreter.
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2
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3 """
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b9063f6f811c Checking in new module code.py -- utilities dealing with code objects.
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4
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5 # Inspired by similar code by Jeff Epler and Fredrik Lundh.
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6
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7
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8 import sys
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9 import traceback
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10 from codeop import CommandCompiler, compile_command
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11
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12 __all__ = ["InteractiveInterpreter", "InteractiveConsole", "interact",
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13 "compile_command"]
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14
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15 def softspace(file, newvalue):
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16 oldvalue = 0
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17 try:
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18 oldvalue = file.softspace
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19 except AttributeError:
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20 pass
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21 try:
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22 file.softspace = newvalue
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23 except (AttributeError, TypeError):
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24 # "attribute-less object" or "read-only attributes"
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25 pass
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26 return oldvalue
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27
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28 class InteractiveInterpreter:
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29 """Base class for InteractiveConsole.
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30
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31 This class deals with parsing and interpreter state (the user's
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32 namespace); it doesn't deal with input buffering or prompting or
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33 input file naming (the filename is always passed in explicitly).
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34
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35 """
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36
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37 def __init__(self, locals=None):
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38 """Constructor.
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39
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40 The optional 'locals' argument specifies the dictionary in
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41 which code will be executed; it defaults to a newly created
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42 dictionary with key "__name__" set to "__console__" and key
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43 "__doc__" set to None.
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44
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45 """
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46 if locals is None:
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47 locals = {"__name__": "__console__", "__doc__": None}
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48 self.locals = locals
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49 self.compile = CommandCompiler()
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50
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51 def runsource(self, source, filename="<input>", symbol="single"):
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52 """Compile and run some source in the interpreter.
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53
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54 Arguments are as for compile_command().
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55
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56 One several things can happen:
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57
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58 1) The input is incorrect; compile_command() raised an
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59 exception (SyntaxError or OverflowError). A syntax traceback
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60 will be printed by calling the showsyntaxerror() method.
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61
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62 2) The input is incomplete, and more input is required;
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63 compile_command() returned None. Nothing happens.
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64
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65 3) The input is complete; compile_command() returned a code
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66 object. The code is executed by calling self.runcode() (which
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67 also handles run-time exceptions, except for SystemExit).
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68
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69 The return value is True in case 2, False in the other cases (unless
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70 an exception is raised). The return value can be used to
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71 decide whether to use sys.ps1 or sys.ps2 to prompt the next
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72 line.
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73
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74 """
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75 try:
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76 code = self.compile(source, filename, symbol)
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77 except (OverflowError, SyntaxError, ValueError):
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78 # Case 1
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79 self.showsyntaxerror(filename)
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80 return False
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81
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82 if code is None:
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83 # Case 2
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84 return True
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85
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86 # Case 3
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87 self.runcode(code)
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88 return False
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89
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90 def runcode(self, code):
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91 """Execute a code object.
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92
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93 When an exception occurs, self.showtraceback() is called to
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94 display a traceback. All exceptions are caught except
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95 SystemExit, which is reraised.
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96
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97 A note about KeyboardInterrupt: this exception may occur
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98 elsewhere in this code, and may not always be caught. The
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99 caller should be prepared to deal with it.
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100
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101 """
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102 try:
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103 exec code in self.locals
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104 except SystemExit:
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105 raise
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106 except:
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107 self.showtraceback()
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108 else:
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109 if softspace(sys.stdout, 0):
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110 print
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111
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112 def showsyntaxerror(self, filename=None):
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113 """Display the syntax error that just occurred.
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114
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115 This doesn't display a stack trace because there isn't one.
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116
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117 If a filename is given, it is stuffed in the exception instead
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118 of what was there before (because Python's parser always uses
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119 "<string>" when reading from a string).
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120
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121 The output is written by self.write(), below.
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122
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123 """
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124 type, value, sys.last_traceback = sys.exc_info()
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125 sys.last_type = type
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126 sys.last_value = value
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127 if filename and type is SyntaxError:
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128 # Work hard to stuff the correct filename in the exception
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129 try:
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130 msg, (dummy_filename, lineno, offset, line) = value
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131 except:
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132 # Not the format we expect; leave it alone
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133 pass
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134 else:
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135 # Stuff in the right filename
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Skip Montanaro <skip@pobox.com>
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136 value = SyntaxError(msg, (filename, lineno, offset, line))
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12c80b570d00 InteractiveInterpreter.showsyntaxerror():
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137 sys.last_value = value
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138 list = traceback.format_exception_only(type, value)
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139 map(self.write, list)
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140
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141 def showtraceback(self):
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142 """Display the exception that just occurred.
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143
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144 We remove the first stack item because it is our own code.
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145
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146 The output is written by self.write(), below.
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147
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148 """
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149 try:
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150 type, value, tb = sys.exc_info()
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151 sys.last_type = type
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152 sys.last_value = value
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153 sys.last_traceback = tb
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154 tblist = traceback.extract_tb(tb)
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155 del tblist[:1]
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156 list = traceback.format_list(tblist)
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157 if list:
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Guido van Rossum <guido@python.org>
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158 list.insert(0, "Traceback (most recent call last):\n")
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159 list[len(list):] = traceback.format_exception_only(type, value)
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160 finally:
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161 tblist = tb = None
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162 map(self.write, list)
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163
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164 def write(self, data):
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165 """Write a string.
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166
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167 The base implementation writes to sys.stderr; a subclass may
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168 replace this with a different implementation.
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169
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170 """
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171 sys.stderr.write(data)
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172
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173
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174 class InteractiveConsole(InteractiveInterpreter):
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175 """Closely emulate the behavior of the interactive Python interpreter.
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176
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177 This class builds on InteractiveInterpreter and adds prompting
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178 using the familiar sys.ps1 and sys.ps2, and input buffering.
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179
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180 """
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181
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182 def __init__(self, locals=None, filename="<console>"):
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Guido van Rossum <guido@python.org>
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183 """Constructor.
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184
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185 The optional locals argument will be passed to the
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186 InteractiveInterpreter base class.
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187
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188 The optional filename argument should specify the (file)name
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189 of the input stream; it will show up in tracebacks.
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190
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191 """
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192 InteractiveInterpreter.__init__(self, locals)
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193 self.filename = filename
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Guido van Rossum <guido@python.org>
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194 self.resetbuffer()
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195
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196 def resetbuffer(self):
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197 """Reset the input buffer."""
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198 self.buffer = []
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199
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200 def interact(self, banner=None):
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201 """Closely emulate the interactive Python console.
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202
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203 The optional banner argument specify the banner to print
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204 before the first interaction; by default it prints a banner
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205 similar to the one printed by the real Python interpreter,
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206 followed by the current class name in parentheses (so as not
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207 to confuse this with the real interpreter -- since it's so
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208 close!).
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209
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210 """
8543
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211 try:
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Guido van Rossum <guido@python.org>
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212 sys.ps1
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Guido van Rossum <guido@python.org>
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213 except AttributeError:
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Guido van Rossum <guido@python.org>
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214 sys.ps1 = ">>> "
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Guido van Rossum <guido@python.org>
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215 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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216 sys.ps2
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Guido van Rossum <guido@python.org>
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217 except AttributeError:
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Guido van Rossum <guido@python.org>
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218 sys.ps2 = "... "
22566
39e42d6f5da2 make default banner match what the real interpreter displays
Skip Montanaro <skip@pobox.com>
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219 cprt = 'Type "help", "copyright", "credits" or "license" for more information.'
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220 if banner is None:
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Guido van Rossum <guido@python.org>
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221 self.write("Python %s on %s\n%s\n(%s)\n" %
15863
71b19d36aafa Make the copyright message the same as for the "real" interpreter.
Guido van Rossum <guido@python.org>
parents: 15847
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222 (sys.version, sys.platform, cprt,
8543
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223 self.__class__.__name__))
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Guido van Rossum <guido@python.org>
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224 else:
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Guido van Rossum <guido@python.org>
parents: 7755
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225 self.write("%s\n" % str(banner))
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Guido van Rossum <guido@python.org>
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226 more = 0
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Guido van Rossum <guido@python.org>
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227 while 1:
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Guido van Rossum <guido@python.org>
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228 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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229 if more:
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Guido van Rossum <guido@python.org>
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230 prompt = sys.ps2
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Guido van Rossum <guido@python.org>
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231 else:
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Guido van Rossum <guido@python.org>
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232 prompt = sys.ps1
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Guido van Rossum <guido@python.org>
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233 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
parents: 7755
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234 line = self.raw_input(prompt)
48191
f1fc947722f2 #1288615: Python code.interact() and non-ASCII input
Antoine Pitrou <solipsis@pitrou.net>
parents: 27878
diff changeset
235 # Can be None if sys.stdin was redefined
f1fc947722f2 #1288615: Python code.interact() and non-ASCII input
Antoine Pitrou <solipsis@pitrou.net>
parents: 27878
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236 encoding = getattr(sys.stdin, "encoding", None)
f1fc947722f2 #1288615: Python code.interact() and non-ASCII input
Antoine Pitrou <solipsis@pitrou.net>
parents: 27878
diff changeset
237 if encoding and not isinstance(line, unicode):
f1fc947722f2 #1288615: Python code.interact() and non-ASCII input
Antoine Pitrou <solipsis@pitrou.net>
parents: 27878
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238 line = line.decode(encoding)
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239 except EOFError:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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240 self.write("\n")
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Guido van Rossum <guido@python.org>
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241 break
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Guido van Rossum <guido@python.org>
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242 else:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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243 more = self.push(line)
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Guido van Rossum <guido@python.org>
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244 except KeyboardInterrupt:
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245 self.write("\nKeyboardInterrupt\n")
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Guido van Rossum <guido@python.org>
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246 self.resetbuffer()
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247 more = 0
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248
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249 def push(self, line):
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Guido van Rossum <guido@python.org>
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250 """Push a line to the interpreter.
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Guido van Rossum <guido@python.org>
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251
9137
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252 The line should not have a trailing newline; it may have
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253 internal newlines. The line is appended to a buffer and the
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254 interpreter's runsource() method is called with the
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255 concatenated contents of the buffer as source. If this
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256 indicates that the command was executed or invalid, the buffer
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257 is reset; otherwise, the command is incomplete, and the buffer
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258 is left as it was after the line was appended. The return
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259 value is 1 if more input is required, 0 if the line was dealt
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260 with in some way (this is the same as runsource()).
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261
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262 """
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263 self.buffer.append(line)
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264 source = "\n".join(self.buffer)
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265 more = self.runsource(source, self.filename)
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266 if not more:
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267 self.resetbuffer()
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268 return more
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269
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270 def raw_input(self, prompt=""):
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271 """Write a prompt and read a line.
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272
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273 The returned line does not include the trailing newline.
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274 When the user enters the EOF key sequence, EOFError is raised.
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275
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276 The base implementation uses the built-in function
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277 raw_input(); a subclass may replace this with a different
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278 implementation.
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279
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280 """
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281 return raw_input(prompt)
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282
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283
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284 def interact(banner=None, readfunc=None, local=None):
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285 """Closely emulate the interactive Python interpreter.
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286
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287 This is a backwards compatible interface to the InteractiveConsole
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288 class. When readfunc is not specified, it attempts to import the
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289 readline module to enable GNU readline if it is available.
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290
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291 Arguments (all optional, all default to None):
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292
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293 banner -- passed to InteractiveConsole.interact()
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294 readfunc -- if not None, replaces InteractiveConsole.raw_input()
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295 local -- passed to InteractiveInterpreter.__init__()
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296
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297 """
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298 console = InteractiveConsole(local)
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299 if readfunc is not None:
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300 console.raw_input = readfunc
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301 else:
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302 try:
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303 import readline
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Skip Montanaro <skip@pobox.com>
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304 except ImportError:
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305 pass
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306 console.interact(banner)
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307
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308
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Guido van Rossum <guido@python.org>
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309 if __name__ == '__main__':
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310 import pdb
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311 pdb.run("interact()\n")