Mercurial > cpython-lru_cache-weakref

annotate Lib/code.py @ 10123:bc287c6cfa23 legacy-trunk

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Restructured a bit.
author Guido van Rossum <guido@python.org>
date Mon, 08 Feb 1999 22:27:18 +0000
parents 913eb31b0317
children d7eca5b0960a
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 Inspired by similar code by Jeff Epler and Fredrik Lundh.
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4 """
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b9063f6f811c Checking in new module code.py -- utilities dealing with code objects.
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5
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6
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7 import sys
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8 import string
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9 import traceback
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10 from codeop import compile_command
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644484e1a37b Add Jeff Epler's interact() function. Note that it is broken.
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11
644484e1a37b Add Jeff Epler's interact() function. Note that it is broken.
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12
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13 class InteractiveInterpreter:
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14 """Base class for InteractiveConsole.
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15
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16 This class deals with parsing and interpreter state (the user's
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17 namespace); it doesn't deal with input buffering or prompting or
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18 input file naming (the filename is always passed in explicitly).
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19
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20 """
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21
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22 def __init__(self, locals=None):
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23 """Constructor.
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24
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25 The optional 'locals' argument specifies the dictionary in
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26 which code will be executed; it defaults to a newly created
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27 dictionary with key "__name__" set to "__console__" and key
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28 "__doc__" set to None.
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29
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30 """
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31 if locals is None:
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32 locals = {"__name__": "__console__", "__doc__": None}
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33 self.locals = locals
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34
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35 def runsource(self, source, filename="<input>", symbol="single"):
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36 """Compile and run some source in the interpreter.
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37
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38 Arguments are as for compile_command().
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39
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40 One several things can happen:
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41
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42 1) The input is incorrect; compile_command() raised an
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43 exception (SyntaxError or OverflowError). A syntax traceback
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44 will be printed by calling the showsyntaxerror() method.
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45
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46 2) The input is incomplete, and more input is required;
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47 compile_command() returned None. Nothing happens.
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48
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49 3) The input is complete; compile_command() returned a code
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50 object. The code is executed by calling self.runcode() (which
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51 also handles run-time exceptions, except for SystemExit).
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52
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53 The return value is 1 in case 2, 0 in the other cases (unless
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54 an exception is raised). The return value can be used to
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55 decide whether to use sys.ps1 or sys.ps2 to prompt the next
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56 line.
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57
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58 """
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59 try:
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60 code = compile_command(source, filename, symbol)
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61 except (OverflowError, SyntaxError):
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62 # Case 1
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63 self.showsyntaxerror(filename)
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64 return 0
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65
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66 if code is None:
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67 # Case 2
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68 return 1
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69
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70 # Case 3
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71 self.runcode(code)
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72 return 0
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73
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74 def runcode(self, code):
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75 """Execute a code object.
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76
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77 When an exception occurs, self.showtraceback() is called to
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78 display a traceback. All exceptions are caught except
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79 SystemExit, which is reraised.
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80
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81 A note about KeyboardInterrupt: this exception may occur
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82 elsewhere in this code, and may not always be caught. The
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83 caller should be prepared to deal with it.
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84
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85 """
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86 try:
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87 exec code in self.locals
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88 except SystemExit:
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89 raise
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90 except:
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91 self.showtraceback()
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92
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93 def showsyntaxerror(self, filename=None):
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94 """Display the syntax error that just occurred.
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95
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96 This doesn't display a stack trace because there isn't one.
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97
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98 If a filename is given, it is stuffed in the exception instead
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99 of what was there before (because Python's parser always uses
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100 "<string>" when reading from a string).
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101
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102 The output is written by self.write(), below.
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103
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104 """
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105 type, value, sys.last_traceback = sys.exc_info()
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106 sys.last_type = type
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107 sys.last_value = value
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108 if filename and type is SyntaxError:
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109 # Work hard to stuff the correct filename in the exception
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110 try:
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111 msg, (dummy_filename, lineno, offset, line) = value
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112 except:
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113 # Not the format we expect; leave it alone
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114 pass
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115 else:
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116 # Stuff in the right filename
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117 try:
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118 # Assume SyntaxError is a class exception
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119 value = SyntaxError(msg, (filename, lineno, offset, line))
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120 except:
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121 # If that failed, assume SyntaxError is a string
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122 value = msg, (filename, lineno, offset, line)
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123 list = traceback.format_exception_only(type, value)
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124 map(self.write, list)
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125
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126 def showtraceback(self):
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127 """Display the exception that just occurred.
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128
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129 We remove the first stack item because it is our own code.
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130
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131 The output is written by self.write(), below.
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132
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133 """
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134 try:
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135 type, value, tb = sys.exc_info()
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136 sys.last_type = type
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137 sys.last_value = value
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138 sys.last_traceback = tb
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139 tblist = traceback.extract_tb(tb)
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140 del tblist[:1]
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141 list = traceback.format_list(tblist)
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142 if list:
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143 list.insert(0, "Traceback (innermost last):\n")
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144 list[len(list):] = traceback.format_exception_only(type, value)
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145 finally:
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146 tblist = tb = None
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147 map(self.write, list)
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148
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149 def write(self, data):
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150 """Write a string.
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151
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152 The base implementation writes to sys.stderr; a subclass may
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153 replace this with a different implementation.
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154
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155 """
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156 sys.stderr.write(data)
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157
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158
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159 class InteractiveConsole(InteractiveInterpreter):
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160 """Closely emulate the behavior of the interactive Python interpreter.
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161
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162 This class builds on InteractiveInterpreter and adds prompting
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163 using the familiar sys.ps1 and sys.ps2, and input buffering.
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164
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165 """
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166
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167 def __init__(self, locals=None, filename="<console>"):
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168 """Constructor.
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169
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170 The optional locals argument will be passed to the
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171 InteractiveInterpreter base class.
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172
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173 The optional filename argument should specify the (file)name
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174 of the input stream; it will show up in tracebacks.
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175
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176 """
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177 InteractiveInterpreter.__init__(self, locals)
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178 self.filename = filename
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179 self.resetbuffer()
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180
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181 def resetbuffer(self):
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182 """Reset the input buffer."""
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183 self.buffer = []
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184
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185 def interact(self, banner=None):
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186 """Closely emulate the interactive Python console.
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187
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188 The optional banner argument specify the banner to print
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189 before the first interaction; by default it prints a banner
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190 similar to the one printed by the real Python interpreter,
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191 followed by the current class name in parentheses (so as not
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192 to confuse this with the real interpreter -- since it's so
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193 close!).
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194
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195 """
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196 try:
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197 sys.ps1
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198 except AttributeError:
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199 sys.ps1 = ">>> "
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200 try:
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201 sys.ps2
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202 except AttributeError:
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203 sys.ps2 = "... "
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204 if banner is None:
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205 self.write("Python %s on %s\n%s\n(%s)\n" %
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206 (sys.version, sys.platform, sys.copyright,
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207 self.__class__.__name__))
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208 else:
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209 self.write("%s\n" % str(banner))
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210 more = 0
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211 while 1:
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212 try:
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213 if more:
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214 prompt = sys.ps2
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215 else:
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216 prompt = sys.ps1
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217 try:
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218 line = self.raw_input(prompt)
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219 except EOFError:
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220 self.write("\n")
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221 break
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222 else:
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223 more = self.push(line)
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224 except KeyboardInterrupt:
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225 self.write("\nKeyboardInterrupt\n")
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226 self.resetbuffer()
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227 more = 0
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228
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229 def push(self, line):
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230 """Push a line to the interpreter.
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231
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232 The line should not have a trailing newline; it may have
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233 internal newlines. The line is appended to a buffer and the
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234 interpreter's runsource() method is called with the
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235 concatenated contents of the buffer as source. If this
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236 indicates that the command was executed or invalid, the buffer
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237 is reset; otherwise, the command is incomplete, and the buffer
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238 is left as it was after the line was appended. The return
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239 value is 1 if more input is required, 0 if the line was dealt
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240 with in some way (this is the same as runsource()).
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241
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242 """
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243 self.buffer.append(line)
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244 source = string.join(self.buffer, "\n")
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245 more = self.runsource(source, self.filename)
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246 if not more:
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247 self.resetbuffer()
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248 return more
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249
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250 def raw_input(self, prompt=""):
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251 """Write a prompt and read a line.
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252
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253 The returned line does not include the trailing newline.
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254 When the user enters the EOF key sequence, EOFError is raised.
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255
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256 The base implementation uses the built-in function
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257 raw_input(); a subclass may replace this with a different
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258 implementation.
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259
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260 """
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261 return raw_input(prompt)
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262
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263
9405
3886165dba42 Rename 'locals' argument to top-level interact() function to 'local'
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264 def interact(banner=None, readfunc=None, local=None):
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265 """Closely emulate the interactive Python interpreter.
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266
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267 This is a backwards compatible interface to the InteractiveConsole
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268 class. When readfunc is not specified, it attempts to import the
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269 readline module to enable GNU readline if it is available.
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270
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271 Arguments (all optional, all default to None):
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272
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273 banner -- passed to InteractiveConsole.interact()
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274 readfunc -- if not None, replaces InteractiveConsole.raw_input()
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275 local -- passed to InteractiveInterpreter.__init__()
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276
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277 """
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parents: 9137
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278 console = InteractiveConsole(local)
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279 if readfunc is not None:
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280 console.raw_input = readfunc
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281 else:
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282 try:
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283 import readline
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284 except:
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285 pass
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286 console.interact(banner)
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287
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288
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289 if __name__ == '__main__':
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290 interact()