Mercurial > cpython-lru_cache-weakref
annotate Misc/python.man @ 58612:ce0d4dc488d2 3.1
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r77877 | matthias.klose | 2010-01-31 17:14:37 +0100 (So, 31 Jan 2010) | 10 lines
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r77875 | matthias.klose | 2010-01-31 17:05:13 +0100 (So, 31 Jan 2010) | 3 lines
- Update python manual page (options -B, -O0, -s, environment variables
PYTHONDONTWRITEBYTECODE, PYTHONNOUSERSITE).
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| author | Matthias Klose <doko@ubuntu.com> |
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| date | Sun, 31 Jan 2010 16:17:23 +0000 |
| parents | 8bc4c8cac7d7 |
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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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| 1529 | 6 .SH NAME |
| 7 python \- an interpreted, interactive, object-oriented programming language | |
| 8 .SH SYNOPSIS | |
| 9 .B python | |
| 10 [ | |
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11 .B \-B |
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17 .B \-E |
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20 .B \-h |
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22 [ |
| 1529 | 23 .B \-i |
| 24 ] | |
| 25 [ | |
| 33682 | 26 .B \-m |
| 27 .I module-name | |
| 28 ] | |
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29 .br |
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31 .B \-O |
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34 .B \-O0 |
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36 [ |
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37 .B -Q |
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38 .I argument |
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40 [ |
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41 .B \-s |
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43 [ |
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44 .B \-S |
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46 [ |
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47 .B \-u |
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49 .br |
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50 [ |
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51 .B \-v |
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53 [ |
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54 .B \-V |
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56 [ |
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57 .B \-W |
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58 .I argument |
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60 [ |
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61 .B \-x |
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63 [ |
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64 .B \-? |
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66 .br |
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67 [ |
| 1529 | 68 .B \-c |
| 69 .I command | |
| 70 | | |
| 71 .I script | |
| 72 | | |
| 73 \- | |
| 74 ] | |
| 75 [ | |
| 76 .I arguments | |
| 77 ] | |
| 78 .SH DESCRIPTION | |
| 79 Python is an interpreted, interactive, object-oriented programming | |
| 80 language that combines remarkable power with very clear syntax. | |
| 81 For an introduction to programming in Python you are referred to the | |
| 82 Python Tutorial. | |
| 83 The Python Library Reference documents built-in and standard types, | |
| 84 constants, functions and modules. | |
| 85 Finally, the Python Reference Manual describes the syntax and | |
| 86 semantics of the core language in (perhaps too) much detail. | |
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87 (These documents may be located via the |
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88 .B "INTERNET RESOURCES" |
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89 below; they may be installed on your system as well.) |
| 1529 | 90 .PP |
| 91 Python's basic power can be extended with your own modules written in | |
| 92 C or C++. | |
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93 On most systems such modules may be dynamically loaded. |
| 1529 | 94 Python is also adaptable as an extension language for existing |
| 95 applications. | |
| 96 See the internal documentation for hints. | |
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97 .PP |
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98 Documentation for installed Python modules and packages can be |
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99 viewed by running the |
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100 .B pydoc |
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101 program. |
| 1529 | 102 .SH COMMAND LINE OPTIONS |
| 103 .TP | |
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104 .B \-B |
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105 Don't write |
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106 .I .py[co] |
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107 files on import. See also PYTHONDONTWRITEBYTECODE. |
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108 .TP |
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109 .BI "\-c " command |
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110 Specify the command to execute (see next section). |
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111 This terminates the option list (following options are passed as |
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112 arguments to the command). |
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113 .TP |
| 1529 | 114 .B \-d |
| 115 Turn on parser debugging output (for wizards only, depending on | |
| 116 compilation options). | |
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117 .TP |
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118 .B \-E |
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119 Ignore environment variables like PYTHONPATH and PYTHONHOME that modify |
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120 the behavior of the interpreter. |
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121 .TP |
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122 .B \-h ", " \-? ", "\-\-help |
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123 Prints the usage for the interpreter executable and exits. |
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124 .TP |
| 1529 | 125 .B \-i |
| 126 When a script is passed as first argument or the \fB\-c\fP option is | |
| 127 used, enter interactive mode after executing the script or the | |
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128 command. It does not read the $PYTHONSTARTUP file. This can be |
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129 useful to inspect global variables or a stack trace when a script |
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130 raises an exception. |
| 1529 | 131 .TP |
| 33682 | 132 .BI "\-m " module-name |
| 133 Searches | |
| 134 .I sys.path | |
| 135 for the named module and runs the corresponding | |
| 136 .I .py | |
| 137 file as a script. | |
| 138 .TP | |
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139 .B \-O |
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140 Turn on basic optimizations. This changes the filename extension for |
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141 compiled (bytecode) files from |
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142 .I .pyc |
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143 to \fI.pyo\fP. Given twice, causes docstrings to be discarded. |
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144 .TP |
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145 .B \-O0 |
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146 Discard docstrings in addition to the \fB-O\fP optimizations. |
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147 .TP |
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148 .BI "\-Q " argument |
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149 Division control; see PEP 238. The argument must be one of "old" (the |
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150 default, int/int and long/long return an int or long), "new" (new |
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151 division semantics, i.e. int/int and long/long returns a float), |
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152 "warn" (old division semantics with a warning for int/int and |
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153 long/long), or "warnall" (old division semantics with a warning for |
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154 all use of the division operator). For a use of "warnall", see the |
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155 Tools/scripts/fixdiv.py script. |
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156 .TP |
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157 .B \-s |
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158 Don't add user site directory to sys.path. |
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159 .TP |
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160 .B \-S |
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161 Disable the import of the module |
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162 .I site |
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163 and the site-dependent manipulations of |
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164 .I sys.path |
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165 that it entails. |
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166 .TP |
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167 .B \-u |
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168 Force stdin, stdout and stderr to be totally unbuffered. On systems |
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169 where it matters, also put stdin, stdout and stderr in binary mode. |
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170 Note that there is internal buffering in readlines() and |
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171 file-object iterators ("for line in sys.stdin") which is not |
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172 influenced by this option. To work around this, you will want to use |
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173 "sys.stdin.readline()" inside a "while 1:" loop. |
| 1529 | 174 .TP |
| 175 .B \-v | |
| 176 Print a message each time a module is initialized, showing the place | |
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177 (filename or built-in module) from which it is loaded. When given |
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178 twice, print a message for each file that is checked for when |
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179 searching for a module. Also provides information on module cleanup |
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180 at exit. |
| 1529 | 181 .TP |
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182 .B \-V ", " \-\-version |
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183 Prints the Python version number of the executable and exits. |
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184 .TP |
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185 .BI "\-W " argument |
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186 Warning control. Python sometimes prints warning message to |
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187 .IR sys.stderr . |
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188 A typical warning message has the following form: |
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189 .IB file ":" line ": " category ": " message. |
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190 By default, each warning is printed once for each source line where it |
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191 occurs. This option controls how often warnings are printed. |
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192 Multiple |
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193 .B \-W |
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194 options may be given; when a warning matches more than one |
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195 option, the action for the last matching option is performed. |
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196 Invalid |
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197 .B \-W |
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198 options are ignored (a warning message is printed about invalid |
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199 options when the first warning is issued). Warnings can also be |
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200 controlled from within a Python program using the |
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201 .I warnings |
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202 module. |
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203 |
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204 The simplest form of |
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205 .I argument |
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206 is one of the following |
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207 .I action |
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208 strings (or a unique abbreviation): |
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209 .B ignore |
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210 to ignore all warnings; |
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211 .B default |
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212 to explicitly request the default behavior (printing each warning once |
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213 per source line); |
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214 .B all |
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215 to print a warning each time it occurs (this may generate many |
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216 messages if a warning is triggered repeatedly for the same source |
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217 line, such as inside a loop); |
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218 .B module |
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219 to print each warning only the first time it occurs in each |
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220 module; |
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221 .B once |
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222 to print each warning only the first time it occurs in the program; or |
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223 .B error |
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224 to raise an exception instead of printing a warning message. |
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225 |
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226 The full form of |
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227 .I argument |
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228 is |
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229 .IB action : message : category : module : line. |
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230 Here, |
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231 .I action |
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232 is as explained above but only applies to messages that match the |
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233 remaining fields. Empty fields match all values; trailing empty |
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234 fields may be omitted. The |
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235 .I message |
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236 field matches the start of the warning message printed; this match is |
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237 case-insensitive. The |
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238 .I category |
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239 field matches the warning category. This must be a class name; the |
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240 match test whether the actual warning category of the message is a |
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241 subclass of the specified warning category. The full class name must |
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242 be given. The |
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243 .I module |
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244 field matches the (fully-qualified) module name; this match is |
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245 case-sensitive. The |
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246 .I line |
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247 field matches the line number, where zero matches all line numbers and |
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248 is thus equivalent to an omitted line number. |
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249 .TP |
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250 .B \-x |
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251 Skip the first line of the source. This is intended for a DOS |
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252 specific hack only. Warning: the line numbers in error messages will |
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253 be off by one! |
| 1529 | 254 .SH INTERPRETER INTERFACE |
| 255 The interpreter interface resembles that of the UNIX shell: when | |
| 256 called with standard input connected to a tty device, it prompts for | |
| 257 commands and executes them until an EOF is read; when called with a | |
| 258 file name argument or with a file as standard input, it reads and | |
| 259 executes a | |
| 260 .I script | |
| 261 from that file; | |
| 262 when called with | |
| 263 .B \-c | |
| 264 .I command, | |
| 265 it executes the Python statement(s) given as | |
| 266 .I command. | |
| 267 Here | |
| 268 .I command | |
| 269 may contain multiple statements separated by newlines. | |
| 270 Leading whitespace is significant in Python statements! | |
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271 In non-interactive mode, the entire input is parsed before it is |
| 1529 | 272 executed. |
| 273 .PP | |
| 274 If available, the script name and additional arguments thereafter are | |
| 275 passed to the script in the Python variable | |
| 276 .I sys.argv , | |
| 277 which is a list of strings (you must first | |
| 278 .I import sys | |
| 279 to be able to access it). | |
| 280 If no script name is given, | |
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281 .I sys.argv[0] |
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282 is an empty string; if |
| 1529 | 283 .B \-c |
| 284 is used, | |
| 285 .I sys.argv[0] | |
| 286 contains the string | |
| 287 .I '-c'. | |
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288 Note that options interpreted by the Python interpreter itself |
| 1529 | 289 are not placed in |
| 290 .I sys.argv. | |
| 291 .PP | |
| 292 In interactive mode, the primary prompt is `>>>'; the second prompt | |
| 293 (which appears when a command is not complete) is `...'. | |
| 294 The prompts can be changed by assignment to | |
| 295 .I sys.ps1 | |
| 296 or | |
| 297 .I sys.ps2. | |
| 298 The interpreter quits when it reads an EOF at a prompt. | |
| 299 When an unhandled exception occurs, a stack trace is printed and | |
| 300 control returns to the primary prompt; in non-interactive mode, the | |
| 301 interpreter exits after printing the stack trace. | |
| 302 The interrupt signal raises the | |
| 303 .I Keyboard\%Interrupt | |
| 304 exception; other UNIX signals are not caught (except that SIGPIPE is | |
| 305 sometimes ignored, in favor of the | |
| 306 .I IOError | |
| 307 exception). Error messages are written to stderr. | |
| 308 .SH FILES AND DIRECTORIES | |
| 309 These are subject to difference depending on local installation | |
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310 conventions; ${prefix} and ${exec_prefix} are installation-dependent |
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311 and should be interpreted as for GNU software; they may be the same. |
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312 The default for both is \fI/usr/local\fP. |
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313 .IP \fI${exec_prefix}/bin/python\fP |
| 1529 | 314 Recommended location of the interpreter. |
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315 .PP |
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316 .I ${prefix}/lib/python<version> |
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317 .br |
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318 .I ${exec_prefix}/lib/python<version> |
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319 .RS |
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320 Recommended locations of the directories containing the standard |
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321 modules. |
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322 .RE |
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323 .PP |
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324 .I ${prefix}/include/python<version> |
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325 .br |
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326 .I ${exec_prefix}/include/python<version> |
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327 .RS |
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328 Recommended locations of the directories containing the include files |
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329 needed for developing Python extensions and embedding the |
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330 interpreter. |
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331 .RE |
| 1529 | 332 .SH ENVIRONMENT VARIABLES |
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333 .IP PYTHONHOME |
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334 Change the location of the standard Python libraries. By default, the |
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335 libraries are searched in ${prefix}/lib/python<version> and |
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336 ${exec_prefix}/lib/python<version>, where ${prefix} and ${exec_prefix} |
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337 are installation-dependent directories, both defaulting to |
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338 \fI/usr/local\fP. When $PYTHONHOME is set to a single directory, its value |
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339 replaces both ${prefix} and ${exec_prefix}. To specify different values |
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340 for these, set $PYTHONHOME to ${prefix}:${exec_prefix}. |
| 1529 | 341 .IP PYTHONPATH |
| 342 Augments the default search path for module files. | |
| 343 The format is the same as the shell's $PATH: one or more directory | |
| 344 pathnames separated by colons. | |
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345 Non-existent directories are silently ignored. |
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346 The default search path is installation dependent, but generally |
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347 begins with ${prefix}/lib/python<version> (see PYTHONHOME above). |
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348 The default search path is always appended to $PYTHONPATH. |
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349 If a script argument is given, the directory containing the script is |
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350 inserted in the path in front of $PYTHONPATH. |
| 1529 | 351 The search path can be manipulated from within a Python program as the |
| 352 variable | |
| 353 .I sys.path . | |
| 354 .IP PYTHONSTARTUP | |
| 355 If this is the name of a readable file, the Python commands in that | |
| 356 file are executed before the first prompt is displayed in interactive | |
| 357 mode. | |
| 358 The file is executed in the same name space where interactive commands | |
| 359 are executed so that objects defined or imported in it can be used | |
| 360 without qualification in the interactive session. | |
| 361 You can also change the prompts | |
| 362 .I sys.ps1 | |
| 363 and | |
| 364 .I sys.ps2 | |
| 365 in this file. | |
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366 .IP PYTHONY2K |
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367 Set this to a non-empty string to cause the \fItime\fP module to |
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368 require dates specified as strings to include 4-digit years, otherwise |
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369 2-digit years are converted based on rules described in the \fItime\fP |
| 23406 | 370 module documentation. |
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371 .IP PYTHONOPTIMIZE |
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372 If this is set to a non-empty string it is equivalent to specifying |
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373 the \fB\-O\fP option. If set to an integer, it is equivalent to |
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374 specifying \fB\-O\fP multiple times. |
| 1529 | 375 .IP PYTHONDEBUG |
| 376 If this is set to a non-empty string it is equivalent to specifying | |
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377 the \fB\-d\fP option. If set to an integer, it is equivalent to |
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378 specifying \fB\-d\fP multiple times. |
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379 .IP PYTHONDONTWRITEBYTECODE |
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380 If this is set to a non-empty string it is equivalent to specifying |
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381 the \fB\-B\fP option (don't try to write |
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382 .I .py[co] |
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383 files). |
| 1529 | 384 .IP PYTHONINSPECT |
| 385 If this is set to a non-empty string it is equivalent to specifying | |
| 386 the \fB\-i\fP option. | |
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387 .IP PYTHONNOUSERSITE |
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388 If this is set to a non-empty string it is equivalent to specifying |
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389 the \fB\-s\fP option (Don't add the user site directory to sys.path). |
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390 .IP PYTHONUNBUFFERED |
| 1529 | 391 If this is set to a non-empty string it is equivalent to specifying |
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392 the \fB\-u\fP option. |
| 1529 | 393 .IP PYTHONVERBOSE |
| 394 If this is set to a non-empty string it is equivalent to specifying | |
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395 the \fB\-v\fP option. If set to an integer, it is equivalent to |
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396 specifying \fB\-v\fP multiple times. |
| 1529 | 397 .SH AUTHOR |
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398 The Python Software Foundation: http://www.python.org/psf |
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399 .SH INTERNET RESOURCES |
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400 Main website: http://www.python.org/ |
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401 .br |
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402 Documentation: http://docs.python.org/py3k/ |
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403 .br |
| 33683 | 404 Developer resources: http://www.python.org/dev/ |
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405 .br |
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406 Downloads: http://python.org/download/ |
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407 .br |
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408 Module repository: http://pypi.python.org/ |
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409 .br |
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410 Newsgroups: comp.lang.python, comp.lang.python.announce |
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411 .SH LICENSING |
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412 Python is distributed under an Open Source license. See the file |
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413 "LICENSE" in the Python source distribution for information on terms & |
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414 conditions for accessing and otherwise using Python and for a |
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415 DISCLAIMER OF ALL WARRANTIES. |
