Mercurial > cpython-lru_cache-weakref

annotate Lib/code.py @ 19814:dc87d91d0dfd legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Don't call MacOS.SchedParams() in MachO, it doesn't exist.
author Jack Jansen <jack.jansen@cwi.nl>
date Sun, 09 Sep 2001 00:36:01 +0000
parents d5acff178ad5
children 03f3ab0c7286
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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parents: 9405
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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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parents:
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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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7
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8 import sys
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9 import traceback
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d5acff178ad5 A fiddled version of the rest of Michael Hudson's SF patch
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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 TypeError: # "attribute-less object" or "read-only attributes"
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24 pass
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25 return oldvalue
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26
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27 class InteractiveInterpreter:
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28 """Base class for InteractiveConsole.
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29
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30 This class deals with parsing and interpreter state (the user's
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31 namespace); it doesn't deal with input buffering or prompting or
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32 input file naming (the filename is always passed in explicitly).
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33
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34 """
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35
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36 def __init__(self, locals=None):
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37 """Constructor.
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38
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39 The optional 'locals' argument specifies the dictionary in
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40 which code will be executed; it defaults to a newly created
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41 dictionary with key "__name__" set to "__console__" and key
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42 "__doc__" set to None.
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43
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44 """
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45 if locals is None:
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46 locals = {"__name__": "__console__", "__doc__": None}
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47 self.locals = locals
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48 self.compile = CommandCompiler()
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49
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50 def runsource(self, source, filename="<input>", symbol="single"):
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51 """Compile and run some source in the interpreter.
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52
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53 Arguments are as for compile_command().
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54
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55 One several things can happen:
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56
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57 1) The input is incorrect; compile_command() raised an
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58 exception (SyntaxError or OverflowError). A syntax traceback
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59 will be printed by calling the showsyntaxerror() method.
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60
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61 2) The input is incomplete, and more input is required;
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62 compile_command() returned None. Nothing happens.
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63
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64 3) The input is complete; compile_command() returned a code
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65 object. The code is executed by calling self.runcode() (which
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66 also handles run-time exceptions, except for SystemExit).
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67
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68 The return value is 1 in case 2, 0 in the other cases (unless
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69 an exception is raised). The return value can be used to
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70 decide whether to use sys.ps1 or sys.ps2 to prompt the next
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71 line.
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72
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73 """
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74 try:
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75 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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76 except (OverflowError, SyntaxError, ValueError):
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77 # Case 1
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78 self.showsyntaxerror(filename)
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79 return 0
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80
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81 if code is None:
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82 # Case 2
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83 return 1
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84
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85 # Case 3
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86 self.runcode(code)
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87 return 0
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88
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89 def runcode(self, code):
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90 """Execute a code object.
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91
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92 When an exception occurs, self.showtraceback() is called to
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93 display a traceback. All exceptions are caught except
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94 SystemExit, which is reraised.
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95
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96 A note about KeyboardInterrupt: this exception may occur
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97 elsewhere in this code, and may not always be caught. The
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98 caller should be prepared to deal with it.
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99
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100 """
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101 try:
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102 exec code in self.locals
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103 except SystemExit:
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104 raise
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105 except:
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106 self.showtraceback()
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107 else:
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108 if softspace(sys.stdout, 0):
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109 print
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110
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111 def showsyntaxerror(self, filename=None):
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112 """Display the syntax error that just occurred.
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113
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114 This doesn't display a stack trace because there isn't one.
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115
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116 If a filename is given, it is stuffed in the exception instead
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117 of what was there before (because Python's parser always uses
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118 "<string>" when reading from a string).
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119
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120 The output is written by self.write(), below.
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121
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122 """
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123 type, value, sys.last_traceback = sys.exc_info()
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124 sys.last_type = type
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125 sys.last_value = value
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126 if filename and type is SyntaxError:
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127 # Work hard to stuff the correct filename in the exception
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128 try:
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129 msg, (dummy_filename, lineno, offset, line) = value
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130 except:
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131 # Not the format we expect; leave it alone
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132 pass
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133 else:
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134 # Stuff in the right filename
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135 try:
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136 # Assume SyntaxError is a class exception
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137 value = SyntaxError(msg, (filename, lineno, offset, line))
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138 except:
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139 # If that failed, assume SyntaxError is a string
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140 value = msg, (filename, lineno, offset, line)
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12c80b570d00 InteractiveInterpreter.showsyntaxerror():
Fred Drake <fdrake@acm.org>
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141 sys.last_value = value
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142 list = traceback.format_exception_only(type, value)
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143 map(self.write, list)
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144
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145 def showtraceback(self):
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146 """Display the exception that just occurred.
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147
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148 We remove the first stack item because it is our own code.
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149
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150 The output is written by self.write(), below.
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151
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152 """
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153 try:
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154 type, value, tb = sys.exc_info()
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155 sys.last_type = type
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156 sys.last_value = value
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157 sys.last_traceback = tb
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158 tblist = traceback.extract_tb(tb)
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159 del tblist[:1]
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160 list = traceback.format_list(tblist)
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161 if list:
15669
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162 list.insert(0, "Traceback (most recent call last):\n")
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163 list[len(list):] = traceback.format_exception_only(type, value)
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164 finally:
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165 tblist = tb = None
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166 map(self.write, list)
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167
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168 def write(self, data):
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169 """Write a string.
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170
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171 The base implementation writes to sys.stderr; a subclass may
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172 replace this with a different implementation.
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173
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174 """
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175 sys.stderr.write(data)
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176
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177
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178 class InteractiveConsole(InteractiveInterpreter):
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179 """Closely emulate the behavior of the interactive Python interpreter.
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180
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181 This class builds on InteractiveInterpreter and adds prompting
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182 using the familiar sys.ps1 and sys.ps2, and input buffering.
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183
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184 """
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185
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186 def __init__(self, locals=None, filename="<console>"):
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187 """Constructor.
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188
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189 The optional locals argument will be passed to the
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190 InteractiveInterpreter base class.
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191
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192 The optional filename argument should specify the (file)name
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193 of the input stream; it will show up in tracebacks.
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194
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195 """
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196 InteractiveInterpreter.__init__(self, locals)
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197 self.filename = filename
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198 self.resetbuffer()
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199
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200 def resetbuffer(self):
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201 """Reset the input buffer."""
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202 self.buffer = []
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203
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204 def interact(self, banner=None):
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205 """Closely emulate the interactive Python console.
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206
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207 The optional banner argument specify the banner to print
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208 before the first interaction; by default it prints a banner
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209 similar to the one printed by the real Python interpreter,
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210 followed by the current class name in parentheses (so as not
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211 to confuse this with the real interpreter -- since it's so
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212 close!).
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213
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214 """
8543
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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.ps1
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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.ps1 = ">>> "
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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219 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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220 sys.ps2
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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221 except AttributeError:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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222 sys.ps2 = "... "
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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223 cprt = 'Type "copyright", "credits" or "license" for more information.'
8543
e951bf2d7d93 Subsume the interact() function in a class. This should make it
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224 if banner is None:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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225 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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226 (sys.version, sys.platform, cprt,
8543
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227 self.__class__.__name__))
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Guido van Rossum <guido@python.org>
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228 else:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
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229 self.write("%s\n" % str(banner))
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Guido van Rossum <guido@python.org>
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230 more = 0
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Guido van Rossum <guido@python.org>
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231 while 1:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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232 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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233 if more:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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234 prompt = sys.ps2
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Guido van Rossum <guido@python.org>
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235 else:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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236 prompt = sys.ps1
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Guido van Rossum <guido@python.org>
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237 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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238 line = self.raw_input(prompt)
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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diff changeset
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")
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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241 break
e951bf2d7d93 Subsume the interact() function in a class. This should make it
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)
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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244 except KeyboardInterrupt:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
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245 self.write("\nKeyboardInterrupt\n")
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246 self.resetbuffer()
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Guido van Rossum <guido@python.org>
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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.
e951bf2d7d93 Subsume the interact() function in a class. This should make it
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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 """
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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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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Guido van Rossum <guido@python.org>
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270 def raw_input(self, prompt=""):
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Guido van Rossum <guido@python.org>
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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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Guido van Rossum <guido@python.org>
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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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Guido van Rossum <guido@python.org>
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303 import readline
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Guido van Rossum <guido@python.org>
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304 except:
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Guido van Rossum <guido@python.org>
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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__':
644484e1a37b Add Jeff Epler's interact() function. Note that it is broken.
Guido van Rossum <guido@python.org>
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310 interact()