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annotate Lib/code.py @ 66978:aed2bbafa550 3.1

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Blocked revisions 87324 via svnmerge ........ r87324 | r.david.murray | 2010-12-16 14:08:51 -0500 (Thu, 16 Dec 2010) | 9 lines #10719: restore messages generated on invalid compileall args Before the introduction of filename arguments to compileall it gave semi useful messages about not being able to 'list' names that weren't valid directories. This fix restores that behavior. In addition to the test for this case, the patch also adds a test for the default behavior of compileall when no arguments are provided, and fixes a bug in one of the previously added tests. ........
author R. David Murray <rdmurray@bitdance.com>
date Thu, 16 Dec 2010 19:10:16 +0000
parents f0e9c3d16766
children 0db67153d25f
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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 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 class InteractiveInterpreter:
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16 """Base class for InteractiveConsole.
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17
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18 This class deals with parsing and interpreter state (the user's
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19 namespace); it doesn't deal with input buffering or prompting or
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20 input file naming (the filename is always passed in explicitly).
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21
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22 """
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23
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24 def __init__(self, locals=None):
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25 """Constructor.
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26
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27 The optional 'locals' argument specifies the dictionary in
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28 which code will be executed; it defaults to a newly created
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29 dictionary with key "__name__" set to "__console__" and key
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30 "__doc__" set to None.
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31
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32 """
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33 if locals is None:
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34 locals = {"__name__": "__console__", "__doc__": None}
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35 self.locals = locals
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36 self.compile = CommandCompiler()
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37
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38 def runsource(self, source, filename="<input>", symbol="single"):
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39 """Compile and run some source in the interpreter.
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40
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41 Arguments are as for compile_command().
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42
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43 One several things can happen:
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44
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45 1) The input is incorrect; compile_command() raised an
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46 exception (SyntaxError or OverflowError). A syntax traceback
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47 will be printed by calling the showsyntaxerror() method.
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48
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49 2) The input is incomplete, and more input is required;
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50 compile_command() returned None. Nothing happens.
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51
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52 3) The input is complete; compile_command() returned a code
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53 object. The code is executed by calling self.runcode() (which
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54 also handles run-time exceptions, except for SystemExit).
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55
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56 The return value is True in case 2, False in the other cases (unless
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57 an exception is raised). The return value can be used to
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58 decide whether to use sys.ps1 or sys.ps2 to prompt the next
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59 line.
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60
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61 """
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62 try:
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63 code = self.compile(source, filename, symbol)
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64 except (OverflowError, SyntaxError, ValueError):
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65 # Case 1
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66 self.showsyntaxerror(filename)
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67 return False
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68
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69 if code is None:
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70 # Case 2
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71 return True
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72
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73 # Case 3
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74 self.runcode(code)
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75 return False
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76
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77 def runcode(self, code):
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78 """Execute a code object.
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79
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80 When an exception occurs, self.showtraceback() is called to
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81 display a traceback. All exceptions are caught except
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82 SystemExit, which is reraised.
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83
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84 A note about KeyboardInterrupt: this exception may occur
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85 elsewhere in this code, and may not always be caught. The
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86 caller should be prepared to deal with it.
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87
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88 """
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89 try:
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90 exec(code, self.locals)
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91 except SystemExit:
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92 raise
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93 except:
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94 self.showtraceback()
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95
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96 def showsyntaxerror(self, filename=None):
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97 """Display the syntax error that just occurred.
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98
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99 This doesn't display a stack trace because there isn't one.
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100
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101 If a filename is given, it is stuffed in the exception instead
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102 of what was there before (because Python's parser always uses
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103 "<string>" when reading from a string).
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104
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105 The output is written by self.write(), below.
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106
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107 """
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108 type, value, sys.last_traceback = sys.exc_info()
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109 sys.last_type = type
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110 sys.last_value = value
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111 if filename and type is SyntaxError:
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112 # Work hard to stuff the correct filename in the exception
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113 try:
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114 msg, (dummy_filename, lineno, offset, line) = value.args
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115 except ValueError:
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116 # Not the format we expect; leave it alone
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117 pass
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118 else:
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119 # Stuff in the right filename
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120 value = SyntaxError(msg, (filename, lineno, offset, line))
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121 sys.last_value = value
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122 lines = traceback.format_exception_only(type, value)
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123 self.write(''.join(lines))
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124
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125 def showtraceback(self):
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126 """Display the exception that just occurred.
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127
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128 We remove the first stack item because it is our own code.
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129
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130 The output is written by self.write(), below.
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131
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132 """
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133 try:
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134 type, value, tb = sys.exc_info()
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135 sys.last_type = type
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136 sys.last_value = value
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137 sys.last_traceback = tb
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138 tblist = traceback.extract_tb(tb)
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139 del tblist[:1]
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140 lines = traceback.format_list(tblist)
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141 if lines:
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142 lines.insert(0, "Traceback (most recent call last):\n")
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143 lines.extend(traceback.format_exception_only(type, value))
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144 finally:
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145 tblist = tb = None
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146 self.write(''.join(lines))
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147
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148 def write(self, data):
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149 """Write a string.
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150
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151 The base implementation writes to sys.stderr; a subclass may
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152 replace this with a different implementation.
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153
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154 """
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155 sys.stderr.write(data)
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156
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157
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158 class InteractiveConsole(InteractiveInterpreter):
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159 """Closely emulate the behavior of the interactive Python interpreter.
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160
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161 This class builds on InteractiveInterpreter and adds prompting
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162 using the familiar sys.ps1 and sys.ps2, and input buffering.
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163
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164 """
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165
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166 def __init__(self, locals=None, filename="<console>"):
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167 """Constructor.
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168
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169 The optional locals argument will be passed to the
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170 InteractiveInterpreter base class.
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171
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172 The optional filename argument should specify the (file)name
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173 of the input stream; it will show up in tracebacks.
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174
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175 """
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176 InteractiveInterpreter.__init__(self, locals)
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177 self.filename = filename
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178 self.resetbuffer()
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179
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180 def resetbuffer(self):
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181 """Reset the input buffer."""
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182 self.buffer = []
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183
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184 def interact(self, banner=None):
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185 """Closely emulate the interactive Python console.
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186
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187 The optional banner argument specifies the banner to print
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188 before the first interaction; by default it prints a banner
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189 similar to the one printed by the real Python interpreter,
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190 followed by the current class name in parentheses (so as not
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191 to confuse this with the real interpreter -- since it's so
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192 close!).
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193
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194 """
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195 try:
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196 sys.ps1
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197 except AttributeError:
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198 sys.ps1 = ">>> "
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199 try:
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200 sys.ps2
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201 except AttributeError:
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202 sys.ps2 = "... "
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Skip Montanaro <skip@pobox.com>
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203 cprt = 'Type "help", "copyright", "credits" or "license" for more information.'
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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, cprt,
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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 = "\n".join(self.buffer)
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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 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 input(prompt)
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262
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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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Skip Montanaro <skip@pobox.com>
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285 except ImportError:
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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 import pdb
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292 pdb.run("interact()\n")