Python / パイソン



「Python」を対話モードで実行する時は、 「python」コマンドを利用して実行する。


「Python」コマンドは、対話モード (インタラクティブ実行モード)もある。

python [option] ... [-c cmd | -m mod | file | -] [arg] ...

-Bdon't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmdprogram passed in as string (terminates option list)
-ddebug output from parser; also PYTHONDEBUG=x
-Eignore PYTHON* environment variables (such as PYTHONPATH)
-hprint this help message and exit (also --help)
-i inspect interactively after running script; forces a prompt even. if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-m mod : run library module as a script (terminates option list)
-Ooptimize generated bytecode slightly; also PYTHONOPTIMIZE=x
-OO remove doc-strings in addition to the -O optimizations
-R use a pseudo-random salt to make hash() values of various types be unpredictable between separate invocations of the interpreter, as a defense against denial-of-service attacks
-Q argdivision options: -Qold (default), -Qwarn, -Qwarnall, -Qnew
-sdon't add user site directory to sys.path; also PYTHONNOUSERSITE
-Sdon't imply 'import site' on initialization
-tissue warnings about inconsistent tab usage (-tt: issue errors)
-uunbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x see man page for details on internal buffering relating to '-u'
-vverbose (trace import statements); also PYTHONVERBOSE=x can be supplied multiple times to increase verbosity
-Vprint the Python version number and exit (also --version)
-W arg : warning control; arg is action:message:category:module:lineno also PYTHONWARNINGS=arg
-xskip first line of source, allowing use of non-Unix forms of #!cmd
-3warn about Python 3.x incompatibilities that 2to3 cannot trivially fix
fileprogram read from script file
- program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Other environment variables:
PYTHONSTARTUPfile executed on interactive startup (no default)
PYTHONPATH':'-separated list of directories prefixed to the default module search path. The result is sys.path.
PYTHONHOMEalternate <prefix> directory (or <prefix>:<exec_prefix>). The default module search path uses /pythonX.X.
PYTHONCASEOKignore case in 'import' statements (Windows).
PYTHONIOENCODINGEncoding[:errors] used for stdin/stdout/stderr.
PYTHONHASHSEED if this variable is set to 'random', the effect is the same as specifying the -R option: a random value is used to seed the hashes of str, bytes and datetime objects. It can also be set to an integer in the range [0,4294967295] to get hash values with a predictable seed.