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annotate Lib/code.py @ 83447:678564fc0962 3.3

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#17789: test_random now works with unittest test discovery. Patch by Zachary Ware.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 19 Apr 2013 05:45:27 +0300
parents a812de69b493
children 8d28d44f3a9a
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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 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, tb = 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 sys.last_traceback = tb
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112 if filename and type is SyntaxError:
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113 # Work hard to stuff the correct filename in the exception
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114 try:
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115 msg, (dummy_filename, lineno, offset, line) = value.args
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116 except ValueError:
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117 # Not the format we expect; leave it alone
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118 pass
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119 else:
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120 # Stuff in the right filename
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121 value = SyntaxError(msg, (filename, lineno, offset, line))
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122 sys.last_value = value
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123 if sys.excepthook is sys.__excepthook__:
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124 lines = traceback.format_exception_only(type, value)
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125 self.write(''.join(lines))
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126 else:
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127 # If someone has set sys.excepthook, we let that take precedence
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128 # over self.write
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129 sys.excepthook(type, value, tb)
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130
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131 def showtraceback(self):
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132 """Display the exception that just occurred.
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133
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134 We remove the first stack item because it is our own code.
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135
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136 The output is written by self.write(), below.
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137
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138 """
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139 try:
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140 type, value, tb = sys.exc_info()
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141 sys.last_type = type
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142 sys.last_value = value
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143 sys.last_traceback = tb
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144 tblist = traceback.extract_tb(tb)
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145 del tblist[:1]
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146 lines = traceback.format_list(tblist)
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147 if lines:
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148 lines.insert(0, "Traceback (most recent call last):\n")
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149 lines.extend(traceback.format_exception_only(type, value))
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150 finally:
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151 tblist = tb = None
78672
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152 if sys.excepthook is sys.__excepthook__:
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153 self.write(''.join(lines))
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154 else:
a812de69b493 Issue #12643: Respect sys.excepthook in code.InteractiveConsole
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155 # If someone has set sys.excepthook, we let that take precedence
a812de69b493 Issue #12643: Respect sys.excepthook in code.InteractiveConsole
Nick Coghlan <ncoghlan@gmail.com>
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156 # over self.write
a812de69b493 Issue #12643: Respect sys.excepthook in code.InteractiveConsole
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parents: 57450
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157 sys.excepthook(type, value, tb)
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158
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159 def write(self, data):
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160 """Write a string.
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161
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162 The base implementation writes to sys.stderr; a subclass may
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163 replace this with a different implementation.
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164
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165 """
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166 sys.stderr.write(data)
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167
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168
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169 class InteractiveConsole(InteractiveInterpreter):
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170 """Closely emulate the behavior of the interactive Python interpreter.
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171
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172 This class builds on InteractiveInterpreter and adds prompting
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173 using the familiar sys.ps1 and sys.ps2, and input buffering.
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174
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175 """
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176
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177 def __init__(self, locals=None, filename="<console>"):
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178 """Constructor.
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179
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180 The optional locals argument will be passed to the
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181 InteractiveInterpreter base class.
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182
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183 The optional filename argument should specify the (file)name
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184 of the input stream; it will show up in tracebacks.
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185
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186 """
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187 InteractiveInterpreter.__init__(self, locals)
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188 self.filename = filename
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189 self.resetbuffer()
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190
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191 def resetbuffer(self):
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192 """Reset the input buffer."""
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193 self.buffer = []
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194
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195 def interact(self, banner=None):
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196 """Closely emulate the interactive Python console.
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197
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198 The optional banner argument specifies the banner to print
9137
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199 before the first interaction; by default it prints a banner
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200 similar to the one printed by the real Python interpreter,
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201 followed by the current class name in parentheses (so as not
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202 to confuse this with the real interpreter -- since it's so
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203 close!).
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204
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205 """
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206 try:
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Guido van Rossum <guido@python.org>
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207 sys.ps1
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208 except AttributeError:
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Guido van Rossum <guido@python.org>
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209 sys.ps1 = ">>> "
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210 try:
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Guido van Rossum <guido@python.org>
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211 sys.ps2
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212 except AttributeError:
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Guido van Rossum <guido@python.org>
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213 sys.ps2 = "... "
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Skip Montanaro <skip@pobox.com>
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214 cprt = 'Type "help", "copyright", "credits" or "license" for more information.'
8543
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215 if banner is None:
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216 self.write("Python %s on %s\n%s\n(%s)\n" %
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71b19d36aafa Make the copyright message the same as for the "real" interpreter.
Guido van Rossum <guido@python.org>
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217 (sys.version, sys.platform, cprt,
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218 self.__class__.__name__))
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219 else:
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220 self.write("%s\n" % str(banner))
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Guido van Rossum <guido@python.org>
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221 more = 0
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Guido van Rossum <guido@python.org>
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222 while 1:
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Guido van Rossum <guido@python.org>
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223 try:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
parents: 7755
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224 if more:
e951bf2d7d93 Subsume the interact() function in a class. This should make it
Guido van Rossum <guido@python.org>
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225 prompt = sys.ps2
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Guido van Rossum <guido@python.org>
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226 else:
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Guido van Rossum <guido@python.org>
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227 prompt = sys.ps1
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228 try:
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229 line = self.raw_input(prompt)
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Guido van Rossum <guido@python.org>
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230 except EOFError:
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Guido van Rossum <guido@python.org>
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231 self.write("\n")
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Guido van Rossum <guido@python.org>
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232 break
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Guido van Rossum <guido@python.org>
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233 else:
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234 more = self.push(line)
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Guido van Rossum <guido@python.org>
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235 except KeyboardInterrupt:
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Guido van Rossum <guido@python.org>
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236 self.write("\nKeyboardInterrupt\n")
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237 self.resetbuffer()
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238 more = 0
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239
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240 def push(self, line):
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Guido van Rossum <guido@python.org>
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241 """Push a line to the interpreter.
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Guido van Rossum <guido@python.org>
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242
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243 The line should not have a trailing newline; it may have
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244 internal newlines. The line is appended to a buffer and the
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245 interpreter's runsource() method is called with the
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246 concatenated contents of the buffer as source. If this
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247 indicates that the command was executed or invalid, the buffer
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248 is reset; otherwise, the command is incomplete, and the buffer
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249 is left as it was after the line was appended. The return
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250 value is 1 if more input is required, 0 if the line was dealt
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251 with in some way (this is the same as runsource()).
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252
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Guido van Rossum <guido@python.org>
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253 """
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Guido van Rossum <guido@python.org>
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254 self.buffer.append(line)
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69f162dcd8b4 String method conversion.
Eric S. Raymond <esr@thyrsus.com>
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255 source = "\n".join(self.buffer)
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256 more = self.runsource(source, self.filename)
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257 if not more:
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258 self.resetbuffer()
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259 return more
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260
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261 def raw_input(self, prompt=""):
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262 """Write a prompt and read a line.
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263
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264 The returned line does not include the trailing newline.
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265 When the user enters the EOF key sequence, EOFError is raised.
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266
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267 The base implementation uses the built-in function
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268 input(); a subclass may replace this with a different
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269 implementation.
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270
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271 """
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272 return input(prompt)
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273
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274
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275
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276 def interact(banner=None, readfunc=None, local=None):
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277 """Closely emulate the interactive Python interpreter.
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278
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279 This is a backwards compatible interface to the InteractiveConsole
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280 class. When readfunc is not specified, it attempts to import the
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281 readline module to enable GNU readline if it is available.
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282
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283 Arguments (all optional, all default to None):
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284
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285 banner -- passed to InteractiveConsole.interact()
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286 readfunc -- if not None, replaces InteractiveConsole.raw_input()
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287 local -- passed to InteractiveInterpreter.__init__()
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288
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289 """
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290 console = InteractiveConsole(local)
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291 if readfunc is not None:
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292 console.raw_input = readfunc
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293 else:
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294 try:
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295 import readline
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296 except ImportError:
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297 pass
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298 console.interact(banner)
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299
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300
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301 if __name__ == "__main__":
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302 interact()