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annotate Misc/python.man @ 65274:e76f554158a8 2.7

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Merged revisions 85436 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r85436 | benjamin.peterson | 2010-10-13 17:20:15 -0500 (Wed, 13 Oct 2010) | 1 line put PYTHONIOENCODING in man page ........
author Benjamin Peterson <benjamin@python.org>
date Wed, 13 Oct 2010 22:25:26 +0000
parents c9e4e12e9cb6
children b36cb4602e21
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1 .TH PYTHON "1" "$Date$"
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3 .\" To view this file while editing, run it through groff:
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4 .\" groff -Tascii -man python.man | less
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6 .SH NAME
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7 python \- an interpreted, interactive, object-oriented programming language
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8 .SH SYNOPSIS
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9 .B python
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19 [
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20 .B \-h
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26 .B \-m
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27 .I module-name
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28 ]
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31 .B \-O
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34 .B \-O0
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37 .B -Q
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38 .I argument
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41 .B \-s
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44 .B \-S
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47 .B \-t
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49 [
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50 .B \-u
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52 .br
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53 [
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54 .B \-v
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55 ]
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57 .B \-V
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59 [
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60 .B \-W
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61 .I argument
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62 ]
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63 [
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64 .B \-x
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67 .B \-3
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70 .B \-?
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75 .I command
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76 |
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77 .I script
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78 |
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79 \-
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81 [
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82 .I arguments
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83 ]
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84 .SH DESCRIPTION
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85 Python is an interpreted, interactive, object-oriented programming
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86 language that combines remarkable power with very clear syntax.
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87 For an introduction to programming in Python you are referred to the
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88 Python Tutorial.
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89 The Python Library Reference documents built-in and standard types,
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90 constants, functions and modules.
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91 Finally, the Python Reference Manual describes the syntax and
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92 semantics of the core language in (perhaps too) much detail.
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93 (These documents may be located via the
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94 .B "INTERNET RESOURCES"
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95 below; they may be installed on your system as well.)
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96 .PP
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97 Python's basic power can be extended with your own modules written in
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98 C or C++.
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99 On most systems such modules may be dynamically loaded.
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100 Python is also adaptable as an extension language for existing
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101 applications.
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102 See the internal documentation for hints.
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103 .PP
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104 Documentation for installed Python modules and packages can be
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105 viewed by running the
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106 .B pydoc
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107 program.
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108 .SH COMMAND LINE OPTIONS
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109 .TP
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110 .B \-B
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111 Don't write
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112 .I .py[co]
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113 files on import. See also PYTHONDONTWRITEBYTECODE.
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114 .TP
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115 .BI "\-c " command
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116 Specify the command to execute (see next section).
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117 This terminates the option list (following options are passed as
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118 arguments to the command).
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119 .TP
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120 .B \-d
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121 Turn on parser debugging output (for wizards only, depending on
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122 compilation options).
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123 .TP
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124 .B \-E
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125 Ignore environment variables like PYTHONPATH and PYTHONHOME that modify
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126 the behavior of the interpreter.
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127 .TP
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128 .B \-h ", " \-? ", "\-\-help
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129 Prints the usage for the interpreter executable and exits.
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130 .TP
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131 .B \-i
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132 When a script is passed as first argument or the \fB\-c\fP option is
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133 used, enter interactive mode after executing the script or the
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134 command. It does not read the $PYTHONSTARTUP file. This can be
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135 useful to inspect global variables or a stack trace when a script
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136 raises an exception.
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137 .TP
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138 .BI "\-m " module-name
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139 Searches
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140 .I sys.path
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141 for the named module and runs the corresponding
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142 .I .py
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143 file as a script.
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144 .TP
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145 .B \-O
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146 Turn on basic optimizations. This changes the filename extension for
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147 compiled (bytecode) files from
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148 .I .pyc
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149 to \fI.pyo\fP. Given twice, causes docstrings to be discarded.
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150 .TP
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151 .B \-O0
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152 Discard docstrings in addition to the \fB-O\fP optimizations.
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153 .TP
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154 .BI "\-Q " argument
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155 Division control; see PEP 238. The argument must be one of "old" (the
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156 default, int/int and long/long return an int or long), "new" (new
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157 division semantics, i.e. int/int and long/long returns a float),
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158 "warn" (old division semantics with a warning for int/int and
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159 long/long), or "warnall" (old division semantics with a warning for
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160 all use of the division operator). For a use of "warnall", see the
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161 Tools/scripts/fixdiv.py script.
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162 .TP
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163 .B \-s
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164 Don't add user site directory to sys.path.
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165 .TP
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166 .B \-S
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167 Disable the import of the module
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168 .I site
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169 and the site-dependent manipulations of
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170 .I sys.path
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171 that it entails.
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172 .TP
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173 .B \-t
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174 Issue a warning when a source file mixes tabs and spaces for
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175 indentation in a way that makes it depend on the worth of a tab
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176 expressed in spaces. Issue an error when the option is given twice.
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177 .TP
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178 .B \-u
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179 Force stdin, stdout and stderr to be totally unbuffered. On systems
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180 where it matters, also put stdin, stdout and stderr in binary mode.
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181 Note that there is internal buffering in xreadlines(), readlines() and
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182 file-object iterators ("for line in sys.stdin") which is not
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183 influenced by this option. To work around this, you will want to use
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184 "sys.stdin.readline()" inside a "while 1:" loop.
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185 .TP
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186 .B \-v
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187 Print a message each time a module is initialized, showing the place
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188 (filename or built-in module) from which it is loaded. When given
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189 twice, print a message for each file that is checked for when
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190 searching for a module. Also provides information on module cleanup
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191 at exit.
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192 .TP
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193 .B \-V ", " \-\-version
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194 Prints the Python version number of the executable and exits.
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195 .TP
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196 .BI "\-W " argument
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197 Warning control. Python sometimes prints warning message to
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198 .IR sys.stderr .
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199 A typical warning message has the following form:
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200 .IB file ":" line ": " category ": " message.
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201 By default, each warning is printed once for each source line where it
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202 occurs. This option controls how often warnings are printed.
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203 Multiple
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204 .B \-W
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205 options may be given; when a warning matches more than one
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206 option, the action for the last matching option is performed.
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207 Invalid
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208 .B \-W
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209 options are ignored (a warning message is printed about invalid
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210 options when the first warning is issued). Warnings can also be
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211 controlled from within a Python program using the
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212 .I warnings
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213 module.
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214
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215 The simplest form of
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216 .I argument
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217 is one of the following
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218 .I action
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219 strings (or a unique abbreviation):
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220 .B ignore
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221 to ignore all warnings;
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222 .B default
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223 to explicitly request the default behavior (printing each warning once
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224 per source line);
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225 .B all
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226 to print a warning each time it occurs (this may generate many
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227 messages if a warning is triggered repeatedly for the same source
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228 line, such as inside a loop);
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229 .B module
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230 to print each warning only the first time it occurs in each
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231 module;
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232 .B once
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233 to print each warning only the first time it occurs in the program; or
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234 .B error
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235 to raise an exception instead of printing a warning message.
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236
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237 The full form of
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238 .I argument
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239 is
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240 .IB action : message : category : module : line.
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241 Here,
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242 .I action
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243 is as explained above but only applies to messages that match the
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244 remaining fields. Empty fields match all values; trailing empty
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245 fields may be omitted. The
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246 .I message
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247 field matches the start of the warning message printed; this match is
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248 case-insensitive. The
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249 .I category
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250 field matches the warning category. This must be a class name; the
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251 match test whether the actual warning category of the message is a
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252 subclass of the specified warning category. The full class name must
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253 be given. The
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254 .I module
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255 field matches the (fully-qualified) module name; this match is
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256 case-sensitive. The
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257 .I line
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258 field matches the line number, where zero matches all line numbers and
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259 is thus equivalent to an omitted line number.
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260 .TP
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261 .B \-x
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262 Skip the first line of the source. This is intended for a DOS
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263 specific hack only. Warning: the line numbers in error messages will
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264 be off by one!
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265 .TP
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266 .B \-3
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267 Warn about Python 3.x incompatibilities that 2to3 cannot trivially fix.
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268 .SH INTERPRETER INTERFACE
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269 The interpreter interface resembles that of the UNIX shell: when
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270 called with standard input connected to a tty device, it prompts for
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271 commands and executes them until an EOF is read; when called with a
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272 file name argument or with a file as standard input, it reads and
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273 executes a
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274 .I script
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275 from that file;
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276 when called with
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277 .B \-c
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278 .I command,
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279 it executes the Python statement(s) given as
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280 .I command.
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281 Here
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282 .I command
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283 may contain multiple statements separated by newlines.
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284 Leading whitespace is significant in Python statements!
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285 In non-interactive mode, the entire input is parsed before it is
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286 executed.
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287 .PP
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288 If available, the script name and additional arguments thereafter are
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289 passed to the script in the Python variable
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290 .I sys.argv ,
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291 which is a list of strings (you must first
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292 .I import sys
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293 to be able to access it).
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294 If no script name is given,
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295 .I sys.argv[0]
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296 is an empty string; if
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297 .B \-c
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298 is used,
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299 .I sys.argv[0]
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300 contains the string
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301 .I '-c'.
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302 Note that options interpreted by the Python interpreter itself
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303 are not placed in
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304 .I sys.argv.
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305 .PP
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306 In interactive mode, the primary prompt is `>>>'; the second prompt
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307 (which appears when a command is not complete) is `...'.
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308 The prompts can be changed by assignment to
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309 .I sys.ps1
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310 or
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311 .I sys.ps2.
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312 The interpreter quits when it reads an EOF at a prompt.
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313 When an unhandled exception occurs, a stack trace is printed and
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314 control returns to the primary prompt; in non-interactive mode, the
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315 interpreter exits after printing the stack trace.
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316 The interrupt signal raises the
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317 .I Keyboard\%Interrupt
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318 exception; other UNIX signals are not caught (except that SIGPIPE is
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319 sometimes ignored, in favor of the
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320 .I IOError
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321 exception). Error messages are written to stderr.
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322 .SH FILES AND DIRECTORIES
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323 These are subject to difference depending on local installation
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324 conventions; ${prefix} and ${exec_prefix} are installation-dependent
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325 and should be interpreted as for GNU software; they may be the same.
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326 The default for both is \fI/usr/local\fP.
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327 .IP \fI${exec_prefix}/bin/python\fP
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328 Recommended location of the interpreter.
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329 .PP
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330 .I ${prefix}/lib/python<version>
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331 .br
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332 .I ${exec_prefix}/lib/python<version>
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333 .RS
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334 Recommended locations of the directories containing the standard
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335 modules.
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336 .RE
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337 .PP
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338 .I ${prefix}/include/python<version>
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339 .br
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340 .I ${exec_prefix}/include/python<version>
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341 .RS
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342 Recommended locations of the directories containing the include files
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343 needed for developing Python extensions and embedding the
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344 interpreter.
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345 .RE
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346 .IP \fI~/.pythonrc.py\fP
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347 User-specific initialization file loaded by the \fIuser\fP module;
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348 not used by default or by most applications.
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349 .SH ENVIRONMENT VARIABLES
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350 .IP PYTHONHOME
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351 Change the location of the standard Python libraries. By default, the
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352 libraries are searched in ${prefix}/lib/python<version> and
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353 ${exec_prefix}/lib/python<version>, where ${prefix} and ${exec_prefix}
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354 are installation-dependent directories, both defaulting to
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355 \fI/usr/local\fP. When $PYTHONHOME is set to a single directory, its value
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356 replaces both ${prefix} and ${exec_prefix}. To specify different values
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357 for these, set $PYTHONHOME to ${prefix}:${exec_prefix}.
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358 .IP PYTHONPATH
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359 Augments the default search path for module files.
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360 The format is the same as the shell's $PATH: one or more directory
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361 pathnames separated by colons.
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362 Non-existent directories are silently ignored.
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363 The default search path is installation dependent, but generally
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364 begins with ${prefix}/lib/python<version> (see PYTHONHOME above).
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365 The default search path is always appended to $PYTHONPATH.
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366 If a script argument is given, the directory containing the script is
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367 inserted in the path in front of $PYTHONPATH.
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368 The search path can be manipulated from within a Python program as the
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369 variable
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370 .I sys.path .
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371 .IP PYTHONSTARTUP
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372 If this is the name of a readable file, the Python commands in that
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373 file are executed before the first prompt is displayed in interactive
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374 mode.
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375 The file is executed in the same name space where interactive commands
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376 are executed so that objects defined or imported in it can be used
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377 without qualification in the interactive session.
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378 You can also change the prompts
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379 .I sys.ps1
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380 and
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381 .I sys.ps2
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382 in this file.
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383 .IP PYTHONY2K
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384 Set this to a non-empty string to cause the \fItime\fP module to
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385 require dates specified as strings to include 4-digit years, otherwise
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386 2-digit years are converted based on rules described in the \fItime\fP
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387 module documentation.
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388 .IP PYTHONOPTIMIZE
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389 If this is set to a non-empty string it is equivalent to specifying
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390 the \fB\-O\fP option. If set to an integer, it is equivalent to
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391 specifying \fB\-O\fP multiple times.
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392 .IP PYTHONDEBUG
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393 If this is set to a non-empty string it is equivalent to specifying
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394 the \fB\-d\fP option. If set to an integer, it is equivalent to
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395 specifying \fB\-d\fP multiple times.
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396 .IP PYTHONDONTWRITEBYTECODE
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397 If this is set to a non-empty string it is equivalent to specifying
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398 the \fB\-B\fP option (don't try to write
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399 .I .py[co]
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400 files).
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401 .IP PYTHONINSPECT
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402 If this is set to a non-empty string it is equivalent to specifying
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403 the \fB\-i\fP option.
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404 .IP PYTHONIOENCODING
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405 If this is set before running the interpreter, it overrides the encoding used
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406 for stdin/stdout/stderr, in the syntax
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407 .IB encodingname ":" errorhandler
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408 The
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409 .IB errorhandler
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410 part is optional and has the same meaning as in str.encode. For stderr, the
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411 .IB errorhandler
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412 part is ignored; the handler will always be \'backslashreplace\'.
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413 .IP PYTHONNOUSERSITE
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414 If this is set to a non-empty string it is equivalent to specifying the
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415 \fB\-s\fP option (Don't add the user site directory to sys.path).
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416 .IP PYTHONUNBUFFERED
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417 If this is set to a non-empty string it is equivalent to specifying
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418 the \fB\-u\fP option.
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419 .IP PYTHONVERBOSE
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420 If this is set to a non-empty string it is equivalent to specifying
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421 the \fB\-v\fP option. If set to an integer, it is equivalent to
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422 specifying \fB\-v\fP multiple times.
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423 .IP PYTHONWARNINGS
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424 If this is set to a comma-separated string it is equivalent to
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425 specifying the \fB\-W\fP option for each separate value.
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426 .SH AUTHOR
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427 The Python Software Foundation: http://www.python.org/psf
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428 .SH INTERNET RESOURCES
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429 Main website: http://www.python.org/
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430 .br
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431 Documentation: http://docs.python.org/
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432 .br
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433 Developer resources: http://www.python.org/dev/
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434 .br
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435 Downloads: http://python.org/download/
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436 .br
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437 Module repository: http://pypi.python.org/
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438 .br
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439 Newsgroups: comp.lang.python, comp.lang.python.announce
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440 .SH LICENSING
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441 Python is distributed under an Open Source license. See the file
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442 "LICENSE" in the Python source distribution for information on terms &
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443 conditions for accessing and otherwise using Python and for a
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444 DISCLAIMER OF ALL WARRANTIES.