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annotate Lib/code.py @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents 128dd6de134c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9441
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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d7eca5b0960a Simple changes by Gerrit Holl - move author acknowledgements out of
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5 # Inspired by similar code by Jeff Epler and Fredrik Lundh.
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6
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913eb31b0317 Moved compile_command() to a file of its own (codeop.py).
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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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03f3ab0c7286 softspace(): be prepared to catch AttributeError as well as TypeError
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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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f83115edf16a mwh@sourceforge found that UnicodeError can be raised by compiling.
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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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136 value = SyntaxError(msg, (filename, lineno, offset, line))
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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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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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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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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 """
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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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215 try:
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Guido van Rossum <guido@python.org>
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216 sys.ps2
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217 except AttributeError:
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Guido van Rossum <guido@python.org>
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218 sys.ps2 = "... "
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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>
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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>
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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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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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233 try:
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Guido van Rossum <guido@python.org>
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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
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235 # Can be None if sys.stdin was redefined
f1fc947722f2 #1288615: Python code.interact() and non-ASCII input
Antoine Pitrou <solipsis@pitrou.net>
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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:
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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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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
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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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Benjamin Peterson <benjamin@python.org>
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309 if __name__ == "__main__":
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Benjamin Peterson <benjamin@python.org>
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310 interact()