Python Command Line


usage: C:\Python310\python.exe [option] … [-c cmd | -m mod | file | -] [arg] …
Options and arguments (and corresponding environment variables):
-b : issue warnings about str(bytes_instance), str(bytearray_instance)
and comparing bytes/bytearray with str. (-bb: issue errors)
-B : don’t write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d : turn on parser debugging output (for experts only, only works on
debug builds); also PYTHONDEBUG=x
-E : ignore PYTHON* environment variables (such as PYTHONPATH)
-h : print 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
-I : isolate Python from the user’s environment (implies -E and -s)
-m mod : run library module as a script (terminates option list)
-O : remove assert and debug-dependent statements; add .opt-1 before
.pyc extension; also PYTHONOPTIMIZE=x
-OO : do -O changes and also discard docstrings; add .opt-2 before
.pyc extension
-q : don’t print version and copyright messages on interactive startup
-s : don’t add user site directory to sys.path; also PYTHONNOUSERSITE
-S : don’t imply ‘import site’ on initialization
-u : force the stdout and stderr streams to be unbuffered;
this option has no effect on stdin; also PYTHONUNBUFFERED=x
-v : verbose (trace import statements); also PYTHONVERBOSE=x
can be supplied multiple times to increase verbosity
-V : print the Python version number and exit (also –version)
when given twice, print more information about the build
-W arg : warning control; arg is action:message:category:module:lineno
also PYTHONWARNINGS=arg
-x : skip first line of source, allowing use of non-Unix forms of #!cmd
-X opt : set implementation-specific option. The following options are available:

     -X faulthandler: enable faulthandler
     -X showrefcount: output the total reference count and number of used
         memory blocks when the program finishes or after each statement in the
         interactive interpreter. This only works on debug builds
     -X tracemalloc: start tracing Python memory allocations using the
         tracemalloc module. By default, only the most recent frame is stored in a
         traceback of a trace. Use -X tracemalloc=NFRAME to start tracing with a
         traceback limit of NFRAME frames
     -X importtime: show how long each import takes. It shows module name,
         cumulative time (including nested imports) and self time (excluding
         nested imports). Note that its output may be broken in multi-threaded
         application. Typical usage is python3 -X importtime -c 'import asyncio'
     -X dev: enable CPython's "development mode", introducing additional runtime
         checks which are too expensive to be enabled by default. Effect of the
         developer mode:
            * Add default warning filter, as -W default
            * Install debug hooks on memory allocators: see the PyMem_SetupDebugHooks() C function
            * Enable the faulthandler module to dump the Python traceback on a crash
            * Enable asyncio debug mode
            * Set the dev_mode attribute of sys.flags to True
            * io.IOBase destructor logs close() exceptions
     -X utf8: enable UTF-8 mode for operating system interfaces, overriding the default
         locale-aware mode. -X utf8=0 explicitly disables UTF-8 mode (even when it would
         otherwise activate automatically)
     -X pycache_prefix=PATH: enable writing .pyc files to a parallel tree rooted at the
         given directory instead of to the code tree
     -X warn_default_encoding: enable opt-in EncodingWarning for 'encoding=None'

–check-hash-based-pycs always|default|never:
control how Python invalidates hash-based .pyc files
file : program 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:
PYTHONSTARTUP: file executed on interactive startup (no default)
PYTHONPATH : ‘;’-separated list of directories prefixed to the
default module search path. The result is sys.path.
PYTHONHOME : alternate directory (or ;).
The default module search path uses \python{major}{minor}.
PYTHONPLATLIBDIR : override sys.platlibdir.
PYTHONCASEOK : ignore case in ‘import’ statements (Windows).
PYTHONUTF8: if set to 1, enable the UTF-8 mode.
PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.
PYTHONFAULTHANDLER: dump the Python traceback on fatal errors.
PYTHONHASHSEED: if this variable is set to ‘random’, a random value is used
to seed the hashes of str and bytes objects. It can also be set to an
integer in the range [0,4294967295] to get hash values with a
predictable seed.
PYTHONMALLOC: set the Python memory allocators and/or install debug hooks
on Python memory allocators. Use PYTHONMALLOC=debug to install debug
hooks.
PYTHONCOERCECLOCALE: if this variable is set to 0, it disables the locale
coercion behavior. Use PYTHONCOERCECLOCALE=warn to request display of
locale coercion and locale compatibility warnings on stderr.
PYTHONBREAKPOINT: if this variable is set to 0, it disables the default
debugger. It can be set to the callable of your debugger of choice.
PYTHONDEVMODE: enable the development mode.
PYTHONPYCACHEPREFIX: root directory for bytecode cache (pyc) files.
PYTHONWARNDEFAULTENCODING: enable opt-in EncodingWarning for ‘encoding=None’.

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