Mercurial > cpython-lru_cache-weakref

annotate Lib/code.py @ 15164:8930ec3bc00a legacy-trunk

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Added additional test cases for pulldom modifications.
author Lars Gustäbel <lars@gustaebel.de>
date Wed, 11 Oct 2000 22:36:00 +0000
parents d7eca5b0960a
children 5c65e676f299
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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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 string
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10 import traceback
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11 from codeop import compile_command
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12
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13
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14 class InteractiveInterpreter:
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15 """Base class for InteractiveConsole.
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16
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17 This class deals with parsing and interpreter state (the user's
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18 namespace); it doesn't deal with input buffering or prompting or
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19 input file naming (the filename is always passed in explicitly).
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20
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21 """
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22
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23 def __init__(self, locals=None):
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24 """Constructor.
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25
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26 The optional 'locals' argument specifies the dictionary in
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27 which code will be executed; it defaults to a newly created
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28 dictionary with key "__name__" set to "__console__" and key
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29 "__doc__" set to None.
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30
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31 """
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32 if locals is None:
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33 locals = {"__name__": "__console__", "__doc__": None}
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34 self.locals = locals
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35
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36 def runsource(self, source, filename="<input>", symbol="single"):
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37 """Compile and run some source in the interpreter.
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38
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39 Arguments are as for compile_command().
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40
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41 One several things can happen:
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42
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43 1) The input is incorrect; compile_command() raised an
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44 exception (SyntaxError or OverflowError). A syntax traceback
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45 will be printed by calling the showsyntaxerror() method.
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46
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47 2) The input is incomplete, and more input is required;
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48 compile_command() returned None. Nothing happens.
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49
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50 3) The input is complete; compile_command() returned a code
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51 object. The code is executed by calling self.runcode() (which
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52 also handles run-time exceptions, except for SystemExit).
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53
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54 The return value is 1 in case 2, 0 in the other cases (unless
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55 an exception is raised). The return value can be used to
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56 decide whether to use sys.ps1 or sys.ps2 to prompt the next
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57 line.
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58
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59 """
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60 try:
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61 code = compile_command(source, filename, symbol)
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62 except (OverflowError, SyntaxError):
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63 # Case 1
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64 self.showsyntaxerror(filename)
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65 return 0
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66
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67 if code is None:
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68 # Case 2
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69 return 1
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70
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71 # Case 3
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72 self.runcode(code)
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73 return 0
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74
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75 def runcode(self, code):
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76 """Execute a code object.
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77
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78 When an exception occurs, self.showtraceback() is called to
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79 display a traceback. All exceptions are caught except
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80 SystemExit, which is reraised.
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81
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82 A note about KeyboardInterrupt: this exception may occur
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83 elsewhere in this code, and may not always be caught. The
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84 caller should be prepared to deal with it.
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85
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86 """
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87 try:
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88 exec code in self.locals
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89 except SystemExit:
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90 raise
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91 except:
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92 self.showtraceback()
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93
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94 def showsyntaxerror(self, filename=None):
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95 """Display the syntax error that just occurred.
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96
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97 This doesn't display a stack trace because there isn't one.
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98
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99 If a filename is given, it is stuffed in the exception instead
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100 of what was there before (because Python's parser always uses
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101 "<string>" when reading from a string).
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102
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103 The output is written by self.write(), below.
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104
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105 """
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106 type, value, sys.last_traceback = sys.exc_info()
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107 sys.last_type = type
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108 sys.last_value = value
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109 if filename and type is SyntaxError:
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110 # Work hard to stuff the correct filename in the exception
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111 try:
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112 msg, (dummy_filename, lineno, offset, line) = value
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113 except:
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114 # Not the format we expect; leave it alone
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115 pass
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116 else:
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117 # Stuff in the right filename
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118 try:
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119 # Assume SyntaxError is a class exception
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120 value = SyntaxError(msg, (filename, lineno, offset, line))
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121 except:
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122 # If that failed, assume SyntaxError is a string
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123 value = msg, (filename, lineno, offset, line)
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124 list = traceback.format_exception_only(type, value)
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125 map(self.write, list)
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126
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127 def showtraceback(self):
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128 """Display the exception that just occurred.
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129
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130 We remove the first stack item because it is our own code.
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131
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132 The output is written by self.write(), below.
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133
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134 """
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135 try:
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136 type, value, tb = sys.exc_info()
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137 sys.last_type = type
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138 sys.last_value = value
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139 sys.last_traceback = tb
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140 tblist = traceback.extract_tb(tb)
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141 del tblist[:1]
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142 list = traceback.format_list(tblist)
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143 if list:
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144 list.insert(0, "Traceback (innermost last):\n")
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145 list[len(list):] = traceback.format_exception_only(type, value)
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146 finally:
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147 tblist = tb = None
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148 map(self.write, list)
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149
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150 def write(self, data):
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151 """Write a string.
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152
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153 The base implementation writes to sys.stderr; a subclass may
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154 replace this with a different implementation.
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155
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156 """
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157 sys.stderr.write(data)
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158
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159
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160 class InteractiveConsole(InteractiveInterpreter):
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161 """Closely emulate the behavior of the interactive Python interpreter.
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162
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163 This class builds on InteractiveInterpreter and adds prompting
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164 using the familiar sys.ps1 and sys.ps2, and input buffering.
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165
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166 """
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167
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168 def __init__(self, locals=None, filename="<console>"):
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169 """Constructor.
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170
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171 The optional locals argument will be passed to the
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172 InteractiveInterpreter base class.
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173
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174 The optional filename argument should specify the (file)name
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175 of the input stream; it will show up in tracebacks.
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176
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177 """
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178 InteractiveInterpreter.__init__(self, locals)
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179 self.filename = filename
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180 self.resetbuffer()
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181
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182 def resetbuffer(self):
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183 """Reset the input buffer."""
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184 self.buffer = []
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185
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186 def interact(self, banner=None):
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187 """Closely emulate the interactive Python console.
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188
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189 The optional banner argument specify the banner to print
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190 before the first interaction; by default it prints a banner
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191 similar to the one printed by the real Python interpreter,
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192 followed by the current class name in parentheses (so as not
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193 to confuse this with the real interpreter -- since it's so
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194 close!).
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195
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196 """
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197 try:
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198 sys.ps1
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199 except AttributeError:
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200 sys.ps1 = ">>> "
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201 try:
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202 sys.ps2
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203 except AttributeError:
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204 sys.ps2 = "... "
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205 if banner is None:
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206 self.write("Python %s on %s\n%s\n(%s)\n" %
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207 (sys.version, sys.platform, sys.copyright,
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208 self.__class__.__name__))
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209 else:
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210 self.write("%s\n" % str(banner))
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211 more = 0
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212 while 1:
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213 try:
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214 if more:
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215 prompt = sys.ps2
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216 else:
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217 prompt = sys.ps1
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218 try:
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219 line = self.raw_input(prompt)
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220 except EOFError:
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221 self.write("\n")
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222 break
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223 else:
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224 more = self.push(line)
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225 except KeyboardInterrupt:
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226 self.write("\nKeyboardInterrupt\n")
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227 self.resetbuffer()
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228 more = 0
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229
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230 def push(self, line):
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231 """Push a line to the interpreter.
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232
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233 The line should not have a trailing newline; it may have
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234 internal newlines. The line is appended to a buffer and the
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235 interpreter's runsource() method is called with the
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236 concatenated contents of the buffer as source. If this
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237 indicates that the command was executed or invalid, the buffer
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238 is reset; otherwise, the command is incomplete, and the buffer
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239 is left as it was after the line was appended. The return
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240 value is 1 if more input is required, 0 if the line was dealt
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241 with in some way (this is the same as runsource()).
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242
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243 """
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244 self.buffer.append(line)
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245 source = string.join(self.buffer, "\n")
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246 more = self.runsource(source, self.filename)
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247 if not more:
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248 self.resetbuffer()
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249 return more
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250
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251 def raw_input(self, prompt=""):
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252 """Write a prompt and read a line.
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253
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254 The returned line does not include the trailing newline.
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255 When the user enters the EOF key sequence, EOFError is raised.
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256
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257 The base implementation uses the built-in function
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258 raw_input(); a subclass may replace this with a different
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259 implementation.
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260
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261 """
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262 return raw_input(prompt)
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263
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264
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265 def interact(banner=None, readfunc=None, local=None):
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266 """Closely emulate the interactive Python interpreter.
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267
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268 This is a backwards compatible interface to the InteractiveConsole
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269 class. When readfunc is not specified, it attempts to import the
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270 readline module to enable GNU readline if it is available.
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271
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272 Arguments (all optional, all default to None):
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273
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274 banner -- passed to InteractiveConsole.interact()
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275 readfunc -- if not None, replaces InteractiveConsole.raw_input()
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276 local -- passed to InteractiveInterpreter.__init__()
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277
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278 """
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279 console = InteractiveConsole(local)
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280 if readfunc is not None:
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281 console.raw_input = readfunc
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282 else:
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283 try:
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284 import readline
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285 except:
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286 pass
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287 console.interact(banner)
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288
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289
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290 if __name__ == '__main__':
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291 interact()