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Title: 1. Command line and environment — Python 3.14.2 documentation

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Description: The CPython interpreter scans the command line and the environment for various settings. CPython implementation detail: Other implementations’ command line schemes may differ. See Alternate Impleme...

Open Graph Description: The CPython interpreter scans the command line and the environment for various settings. CPython implementation detail: Other implementations’ command line schemes may differ. See Alternate Impleme...

Opengraph URL: https://docs.python.org/3/using/cmdline.html

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og:image:alt	The CPython interpreter scans the command line and the environment for various settings. CPython implementation detail: Other implementations’ command line schemes may differ. See Alternate Impleme...
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Links:

	https://www.python.org/
Table of Contents	https://docs.python.org/3/contents.html
1. Command line and environment	https://docs.python.org/3/using/cmdline.html
1.1. Command line	https://docs.python.org/3/using/cmdline.html#command-line
1.1.1. Interface options	https://docs.python.org/3/using/cmdline.html#interface-options
1.1.2. Generic options	https://docs.python.org/3/using/cmdline.html#generic-options
1.1.3. Miscellaneous options	https://docs.python.org/3/using/cmdline.html#miscellaneous-options
1.1.4. Controlling color	https://docs.python.org/3/using/cmdline.html#controlling-color
1.2. Environment variables	https://docs.python.org/3/using/cmdline.html#environment-variables
1.2.1. Debug-mode variables	https://docs.python.org/3/using/cmdline.html#debug-mode-variables
Python Setup and Usage	https://docs.python.org/3/using/index.html
2. Using Python on Unix platforms	https://docs.python.org/3/using/unix.html
Report a bug	https://docs.python.org/3/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/using/cmdline.rst?plain=1
index	https://docs.python.org/3/genindex.html
modules	https://docs.python.org/3/py-modindex.html
next	https://docs.python.org/3/using/unix.html
previous	https://docs.python.org/3/using/index.html
Python	https://www.python.org/
3.14.2 Documentation	https://docs.python.org/3/index.html
Python Setup and Usage	https://docs.python.org/3/using/index.html
1. Command line and environment	https://docs.python.org/3/using/cmdline.html
¶	https://docs.python.org/3/using/cmdline.html#command-line-and-environment
Alternate Implementations	https://docs.python.org/3/reference/introduction.html#implementations
¶	https://docs.python.org/3/using/cmdline.html#command-line
¶	https://docs.python.org/3/using/cmdline.html#interface-options
Interactive Mode	https://docs.python.org/3/tutorial/appendix.html#tut-interac
sys.argv	https://docs.python.org/3/library/sys.html#sys.argv
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-c
sys.argv	https://docs.python.org/3/library/sys.html#sys.argv
sys.path	https://docs.python.org/3/library/sys.html#sys.path
auditing event	https://docs.python.org/3/library/sys.html#auditing
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-m
sys.path	https://docs.python.org/3/library/sys.html#sys.path
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
sys.argv	https://docs.python.org/3/library/sys.html#sys.argv
-c	https://docs.python.org/3/using/cmdline.html#cmdoption-c
sys.path	https://docs.python.org/3/library/sys.html#sys.path
-I	https://docs.python.org/3/using/cmdline.html#cmdoption-I
sys.path	https://docs.python.org/3/library/sys.html#sys.path
timeit	https://docs.python.org/3/library/timeit.html#module-timeit
auditing event	https://docs.python.org/3/library/sys.html#auditing
runpy.run_module()	https://docs.python.org/3/library/runpy.html#runpy.run_module
PEP 338	https://peps.python.org/pep-0338/
sys.stdin	https://docs.python.org/3/library/sys.html#sys.stdin
-i	https://docs.python.org/3/using/cmdline.html#cmdoption-i
sys.argv	https://docs.python.org/3/library/sys.html#sys.argv
sys.path	https://docs.python.org/3/library/sys.html#sys.path
auditing event	https://docs.python.org/3/library/sys.html#auditing
sys.argv	https://docs.python.org/3/library/sys.html#sys.argv
sys.path	https://docs.python.org/3/library/sys.html#sys.path
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
sys.path	https://docs.python.org/3/library/sys.html#sys.path
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
-I	https://docs.python.org/3/using/cmdline.html#cmdoption-I
sys.path	https://docs.python.org/3/library/sys.html#sys.path
auditing event	https://docs.python.org/3/library/sys.html#auditing
runpy.run_path()	https://docs.python.org/3/library/runpy.html#runpy.run_path
-i	https://docs.python.org/3/using/cmdline.html#cmdoption-i
sys.path	https://docs.python.org/3/library/sys.html#sys.path
Readline configuration	https://docs.python.org/3/library/site.html#rlcompleter-config
Invoking the Interpreter	https://docs.python.org/3/tutorial/interpreter.html#tut-invoking
¶	https://docs.python.org/3/using/cmdline.html#generic-options
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-0
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-h
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-help
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-help-env
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-help-xoptions
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-help-all
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-V
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-version
¶	https://docs.python.org/3/using/cmdline.html#miscellaneous-options
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-b
bytes	https://docs.python.org/3/library/stdtypes.html#bytes
bytearray	https://docs.python.org/3/library/stdtypes.html#bytearray
str	https://docs.python.org/3/library/stdtypes.html#str
int	https://docs.python.org/3/library/functions.html#int
bytes	https://docs.python.org/3/library/stdtypes.html#bytes
int	https://docs.python.org/3/library/functions.html#int
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-B
PYTHONDONTWRITEBYTECODE	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDONTWRITEBYTECODE
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-check-hash-based-pycs
Cached bytecode invalidation	https://docs.python.org/3/reference/import.html#pyc-invalidation
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-d
PYTHONDEBUG	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDEBUG
debug build of Python	https://docs.python.org/3/using/configure.html#debug-build
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-E
PYTHONPATH	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH
PYTHONHOME	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHOME
-P	https://docs.python.org/3/using/cmdline.html#cmdoption-P
-I	https://docs.python.org/3/using/cmdline.html#cmdoption-I
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-i
-i	https://docs.python.org/3/using/cmdline.html#cmdoption-i
-c	https://docs.python.org/3/using/cmdline.html#cmdoption-c
-m	https://docs.python.org/3/using/cmdline.html#cmdoption-m
sys.stdin	https://docs.python.org/3/library/sys.html#sys.stdin
PYTHONSTARTUP	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONSTARTUP
PYTHONINSPECT	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONINSPECT
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-I
-E	https://docs.python.org/3/using/cmdline.html#cmdoption-E
-P	https://docs.python.org/3/using/cmdline.html#cmdoption-P
-s	https://docs.python.org/3/using/cmdline.html#cmdoption-s
sys.path	https://docs.python.org/3/library/sys.html#sys.path
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-O
__debug__	https://docs.python.org/3/library/constants.html#debug__
bytecode	https://docs.python.org/3/glossary.html#term-bytecode
PEP 488	https://peps.python.org/pep-0488/
PYTHONOPTIMIZE	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONOPTIMIZE
PEP 488	https://peps.python.org/pep-0488/
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-OO
-O	https://docs.python.org/3/using/cmdline.html#cmdoption-O
bytecode	https://docs.python.org/3/glossary.html#term-bytecode
PEP 488	https://peps.python.org/pep-0488/
PEP 488	https://peps.python.org/pep-0488/
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-P
sys.path	https://docs.python.org/3/library/sys.html#sys.path
PYTHONSAFEPATH	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONSAFEPATH
-E	https://docs.python.org/3/using/cmdline.html#cmdoption-E
-I	https://docs.python.org/3/using/cmdline.html#cmdoption-I
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-q
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-R
PYTHONHASHSEED	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHASHSEED
__hash__()	https://docs.python.org/3/reference/datamodel.html#object.__hash__
http://ocert.org/advisories/ocert-2011-003.html	http://ocert.org/advisories/ocert-2011-003.html
PYTHONHASHSEED	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHASHSEED
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-s
user site-packages directory	https://docs.python.org/3/library/site.html#site.USER_SITE
sys.path	https://docs.python.org/3/library/sys.html#sys.path
PYTHONNOUSERSITE	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONNOUSERSITE
PEP 370	https://peps.python.org/pep-0370/
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-S
site	https://docs.python.org/3/library/site.html#module-site
sys.path	https://docs.python.org/3/library/sys.html#sys.path
site	https://docs.python.org/3/library/site.html#module-site
site.main()	https://docs.python.org/3/library/site.html#site.main
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-u
PYTHONUNBUFFERED	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUNBUFFERED
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-v
site	https://docs.python.org/3/library/site.html#module-site
PYTHONVERBOSE	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONVERBOSE
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-W
sys.stderr	https://docs.python.org/3/library/sys.html#sys.stderr
-W	https://docs.python.org/3/using/cmdline.html#cmdoption-W
-W	https://docs.python.org/3/using/cmdline.html#cmdoption-W
PYTHONWARNINGS	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONWARNINGS
warnings	https://docs.python.org/3/library/warnings.html#module-warnings
warnings.filterwarnings()	https://docs.python.org/3/library/warnings.html#warnings.filterwarnings
The Warnings Filter	https://docs.python.org/3/library/warnings.html#warning-filter
Describing Warning Filters	https://docs.python.org/3/library/warnings.html#describing-warning-filters
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-x
¶	https://docs.python.org/3/using/cmdline.html#cmdoption-X
faulthandler	https://docs.python.org/3/library/faulthandler.html#module-faulthandler
PYTHONFAULTHANDLER	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONFAULTHANDLER
debug builds	https://docs.python.org/3/using/configure.html#debug-build
tracemalloc	https://docs.python.org/3/library/tracemalloc.html#module-tracemalloc
tracemalloc.start()	https://docs.python.org/3/library/tracemalloc.html#tracemalloc.start
PYTHONTRACEMALLOC	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONTRACEMALLOC
integer string conversion length limitation	https://docs.python.org/3/library/stdtypes.html#int-max-str-digits
PYTHONINTMAXSTRDIGITS	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONINTMAXSTRDIGITS
PYTHONPROFILEIMPORTTIME	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPROFILEIMPORTTIME
Python Development Mode	https://docs.python.org/3/library/devmode.html#devmode
PYTHONDEVMODE	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDEVMODE
Python UTF-8 Mode	https://docs.python.org/3/library/os.html#utf8-mode
Python UTF-8 Mode	https://docs.python.org/3/library/os.html#utf8-mode
PYTHONUTF8	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUTF8
PYTHONPYCACHEPREFIX	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPYCACHEPREFIX
EncodingWarning	https://docs.python.org/3/library/exceptions.html#EncodingWarning
PYTHONWARNDEFAULTENCODING	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONWARNDEFAULTENCODING
PYTHONNODEBUGRANGES	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONNODEBUGRANGES
PYTHON_FROZEN_MODULES	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_FROZEN_MODULES
PYTHONPERFSUPPORT	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPERFSUPPORT
Python support for the Linux perf profiler	https://docs.python.org/3/howto/perf_profiling.html#perf-profiling
PYTHON_PERF_JIT_SUPPORT	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_PERF_JIT_SUPPORT
Python support for the Linux perf profiler	https://docs.python.org/3/howto/perf_profiling.html#perf-profiling
PEP 768	https://peps.python.org/pep-0768/
PYTHON_DISABLE_REMOTE_DEBUG	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_DISABLE_REMOTE_DEBUG
PEP 768	https://peps.python.org/pep-0768/
os.cpu_count()	https://docs.python.org/3/library/os.html#os.cpu_count
os.process_cpu_count()	https://docs.python.org/3/library/os.html#os.process_cpu_count
multiprocessing.cpu_count()	https://docs.python.org/3/library/multiprocessing.html#multiprocessing.cpu_count
PYTHON_CPU_COUNT	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_CPU_COUNT
site	https://docs.python.org/3/library/site.html#module-site
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
built in debug mode	https://docs.python.org/3/using/configure.html#debug-build
PYTHON_PRESITE	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_PRESITE
--disable-gil	https://docs.python.org/3/using/configure.html#cmdoption-disable-gil
PYTHON_GIL	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_GIL
Free-threaded CPython	https://docs.python.org/3/whatsnew/3.13.html#whatsnew313-free-threaded-cpython
Thread	https://docs.python.org/3/library/threading.html#threading.Thread
PYTHON_THREAD_INHERIT_CONTEXT	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_THREAD_INHERIT_CONTEXT
warnings.catch_warnings	https://docs.python.org/3/library/warnings.html#warnings.catch_warnings
ContextVar	https://docs.python.org/3/library/contextvars.html#contextvars.ContextVar
PYTHON_CONTEXT_AWARE_WARNINGS	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_CONTEXT_AWARE_WARNINGS
--disable-gil	https://docs.python.org/3/using/configure.html#cmdoption-disable-gil
PYTHON_TLBC	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_TLBC
sys._xoptions	https://docs.python.org/3/library/sys.html#sys._xoptions
Jython	https://www.jython.org/
¶	https://docs.python.org/3/using/cmdline.html#controlling-color
FORCE_COLOR	https://force-color.org/
NO_COLOR	https://no-color.org/
PYTHON_COLORS	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_COLORS
¶	https://docs.python.org/3/using/cmdline.html#environment-variables
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHOME
PYTHONHOME	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHOME
PYTHONHOME	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHOME
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH
os.pathsep	https://docs.python.org/3/library/os.html#os.pathsep
PYTHONPATH	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH
PYTHONHOME	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHOME
PYTHONPATH	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH
PYTHONPATH	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH
Interface options	https://docs.python.org/3/using/cmdline.html#using-on-interface-options
sys.path	https://docs.python.org/3/library/sys.html#sys.path
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONSAFEPATH
sys.path	https://docs.python.org/3/library/sys.html#sys.path
-P	https://docs.python.org/3/using/cmdline.html#cmdoption-P
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPLATLIBDIR
sys.platlibdir	https://docs.python.org/3/library/sys.html#sys.platlibdir
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONSTARTUP
sys.ps1	https://docs.python.org/3/library/sys.html#sys.ps1
sys.ps2	https://docs.python.org/3/library/sys.html#sys.ps2
sys.__interactivehook__	https://docs.python.org/3/library/sys.html#sys.__interactivehook__
auditing event	https://docs.python.org/3/library/sys.html#auditing
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONOPTIMIZE
-O	https://docs.python.org/3/using/cmdline.html#cmdoption-O
-O	https://docs.python.org/3/using/cmdline.html#cmdoption-O
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONBREAKPOINT
sys.breakpointhook()	https://docs.python.org/3/library/sys.html#sys.breakpointhook
breakpoint()	https://docs.python.org/3/library/functions.html#breakpoint
sys.breakpointhook()	https://docs.python.org/3/library/sys.html#sys.breakpointhook
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDEBUG
-d	https://docs.python.org/3/using/cmdline.html#cmdoption-d
-d	https://docs.python.org/3/using/cmdline.html#cmdoption-d
debug build of Python	https://docs.python.org/3/using/configure.html#debug-build
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONINSPECT
-i	https://docs.python.org/3/using/cmdline.html#cmdoption-i
os.environ	https://docs.python.org/3/library/os.html#os.environ
auditing event	https://docs.python.org/3/library/sys.html#auditing
PYTHONSTARTUP	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONSTARTUP
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUNBUFFERED
-u	https://docs.python.org/3/using/cmdline.html#cmdoption-u
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONVERBOSE
-v	https://docs.python.org/3/using/cmdline.html#cmdoption-v
-v	https://docs.python.org/3/using/cmdline.html#cmdoption-v
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONCASEOK
import	https://docs.python.org/3/reference/simple_stmts.html#import
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDONTWRITEBYTECODE
-B	https://docs.python.org/3/using/cmdline.html#cmdoption-B
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPYCACHEPREFIX
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHASHSEED
PYTHONHASHSEED	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHASHSEED
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONINTMAXSTRDIGITS
integer string conversion length limitation	https://docs.python.org/3/library/stdtypes.html#int-max-str-digits
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONIOENCODING
str.encode()	https://docs.python.org/3/library/stdtypes.html#str.encode
PYTHONLEGACYWINDOWSSTDIO	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONLEGACYWINDOWSSTDIO
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONNOUSERSITE
user site-packages directory	https://docs.python.org/3/library/site.html#site.USER_SITE
sys.path	https://docs.python.org/3/library/sys.html#sys.path
PEP 370	https://peps.python.org/pep-0370/
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUSERBASE
user base directory	https://docs.python.org/3/library/site.html#site.USER_BASE
user site-packages directory	https://docs.python.org/3/library/site.html#site.USER_SITE
installation paths	https://docs.python.org/3/library/sysconfig.html#sysconfig-user-scheme
PEP 370	https://peps.python.org/pep-0370/
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONEXECUTABLE
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONWARNINGS
-W	https://docs.python.org/3/using/cmdline.html#cmdoption-W
-W	https://docs.python.org/3/using/cmdline.html#cmdoption-W
The Warnings Filter	https://docs.python.org/3/library/warnings.html#warning-filter
Describing Warning Filters	https://docs.python.org/3/library/warnings.html#describing-warning-filters
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONFAULTHANDLER
faulthandler.enable()	https://docs.python.org/3/library/faulthandler.html#faulthandler.enable
SIGSEGV	https://docs.python.org/3/library/signal.html#signal.SIGSEGV
SIGFPE	https://docs.python.org/3/library/signal.html#signal.SIGFPE
SIGABRT	https://docs.python.org/3/library/signal.html#signal.SIGABRT
SIGBUS	https://docs.python.org/3/library/signal.html#signal.SIGBUS
SIGILL	https://docs.python.org/3/library/signal.html#signal.SIGILL
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONTRACEMALLOC
tracemalloc	https://docs.python.org/3/library/tracemalloc.html#module-tracemalloc
tracemalloc.start()	https://docs.python.org/3/library/tracemalloc.html#tracemalloc.start
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPROFILEIMPORTTIME
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONASYNCIODEBUG
debug mode	https://docs.python.org/3/library/asyncio-dev.html#asyncio-debug-mode
asyncio	https://docs.python.org/3/library/asyncio.html#module-asyncio
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONMALLOC
default memory allocators	https://docs.python.org/3/c-api/memory.html#default-memory-allocators
PYMEM_DOMAIN_RAW	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_RAW
PYMEM_DOMAIN_MEM	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_MEM
PYMEM_DOMAIN_OBJ	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_OBJ
pymalloc allocator	https://docs.python.org/3/c-api/memory.html#pymalloc
PYMEM_DOMAIN_MEM	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_MEM
PYMEM_DOMAIN_OBJ	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_OBJ
PYMEM_DOMAIN_RAW	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_RAW
mimalloc allocator	https://docs.python.org/3/c-api/memory.html#mimalloc
PYMEM_DOMAIN_MEM	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_MEM
PYMEM_DOMAIN_OBJ	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_OBJ
PYMEM_DOMAIN_RAW	https://docs.python.org/3/c-api/memory.html#c.PYMEM_DOMAIN_RAW
debug hooks	https://docs.python.org/3/c-api/memory.html#pymem-debug-hooks
default memory allocators	https://docs.python.org/3/c-api/memory.html#default-memory-allocators
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONMALLOCSTATS
pymalloc memory allocator	https://docs.python.org/3/c-api/memory.html#pymalloc
PYTHONMALLOC	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONMALLOC
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONLEGACYWINDOWSFSENCODING
filesystem encoding and error handler	https://docs.python.org/3/glossary.html#term-filesystem-encoding-and-error-handler
sys._enablelegacywindowsfsencoding()	https://docs.python.org/3/library/sys.html#sys._enablelegacywindowsfsencoding
Availability	https://docs.python.org/3/library/intro.html#availability
PEP 529	https://peps.python.org/pep-0529/
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONLEGACYWINDOWSSTDIO
Availability	https://docs.python.org/3/library/intro.html#availability
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONCOERCECLOCALE
locale.getdefaultlocale()	https://docs.python.org/3/library/locale.html#locale.getdefaultlocale
error handler	https://docs.python.org/3/library/codecs.html#error-handlers
sys.stdin	https://docs.python.org/3/library/sys.html#sys.stdin
sys.stdout	https://docs.python.org/3/library/sys.html#sys.stdout
sys.stderr	https://docs.python.org/3/library/sys.html#sys.stderr
PYTHONIOENCODING	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONIOENCODING
PYTHONUTF8	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUTF8
Availability	https://docs.python.org/3/library/intro.html#availability
PEP 538	https://peps.python.org/pep-0538/
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDEVMODE
Python Development Mode	https://docs.python.org/3/library/devmode.html#devmode
-X	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUTF8
Python UTF-8 Mode	https://docs.python.org/3/library/os.html#utf8-mode
Python UTF-8 Mode	https://docs.python.org/3/library/os.html#utf8-mode
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONWARNDEFAULTENCODING
EncodingWarning	https://docs.python.org/3/library/exceptions.html#EncodingWarning
Opt-in EncodingWarning	https://docs.python.org/3/library/io.html#io-encoding-warning
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONNODEBUGRANGES
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPERFSUPPORT
-X perf	https://docs.python.org/3/using/cmdline.html#cmdoption-X
Python support for the Linux perf profiler	https://docs.python.org/3/howto/perf_profiling.html#perf-profiling
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_PERF_JIT_SUPPORT
-X perf_jit	https://docs.python.org/3/using/cmdline.html#cmdoption-X
Python support for the Linux perf profiler	https://docs.python.org/3/howto/perf_profiling.html#perf-profiling
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_DISABLE_REMOTE_DEBUG
PEP 768	https://peps.python.org/pep-0768/
-X disable_remote_debug	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_CPU_COUNT
os.cpu_count()	https://docs.python.org/3/library/os.html#os.cpu_count
os.process_cpu_count()	https://docs.python.org/3/library/os.html#os.process_cpu_count
-X cpu_count	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_FROZEN_MODULES
-X frozen_modules	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_COLORS
Controlling color	https://docs.python.org/3/using/cmdline.html#using-on-controlling-color
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_BASIC_REPL
REPL	https://docs.python.org/3/glossary.html#term-REPL
readline	https://docs.python.org/3/library/readline.html#module-readline
REPL	https://docs.python.org/3/glossary.html#term-REPL
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_HISTORY
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_GIL
--disable-gil	https://docs.python.org/3/using/configure.html#cmdoption-disable-gil
-X gil	https://docs.python.org/3/using/cmdline.html#cmdoption-X
Free-threaded CPython	https://docs.python.org/3/whatsnew/3.13.html#whatsnew313-free-threaded-cpython
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_THREAD_INHERIT_CONTEXT
Thread	https://docs.python.org/3/library/threading.html#threading.Thread
-X thread_inherit_context	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_CONTEXT_AWARE_WARNINGS
warnings.catch_warnings	https://docs.python.org/3/library/warnings.html#warnings.catch_warnings
ContextVar	https://docs.python.org/3/library/contextvars.html#contextvars.ContextVar
-X context_aware_warnings	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_JIT
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_TLBC
--disable-gil	https://docs.python.org/3/using/configure.html#cmdoption-disable-gil
-X tlbc	https://docs.python.org/3/using/cmdline.html#cmdoption-X
¶	https://docs.python.org/3/using/cmdline.html#debug-mode-variables
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDUMPREFS
--with-trace-refs	https://docs.python.org/3/using/configure.html#cmdoption-with-trace-refs
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDUMPREFSFILE
--with-trace-refs	https://docs.python.org/3/using/configure.html#cmdoption-with-trace-refs
¶	https://docs.python.org/3/using/cmdline.html#envvar-PYTHON_PRESITE
site	https://docs.python.org/3/library/site.html#module-site
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
__main__	https://docs.python.org/3/library/__main__.html#module-__main__
-X presite	https://docs.python.org/3/using/cmdline.html#cmdoption-X
--with-pydebug	https://docs.python.org/3/using/configure.html#cmdoption-with-pydebug
Table of Contents	https://docs.python.org/3/contents.html
1. Command line and environment	https://docs.python.org/3/using/cmdline.html
1.1. Command line	https://docs.python.org/3/using/cmdline.html#command-line
1.1.1. Interface options	https://docs.python.org/3/using/cmdline.html#interface-options
1.1.2. Generic options	https://docs.python.org/3/using/cmdline.html#generic-options
1.1.3. Miscellaneous options	https://docs.python.org/3/using/cmdline.html#miscellaneous-options
1.1.4. Controlling color	https://docs.python.org/3/using/cmdline.html#controlling-color
1.2. Environment variables	https://docs.python.org/3/using/cmdline.html#environment-variables
1.2.1. Debug-mode variables	https://docs.python.org/3/using/cmdline.html#debug-mode-variables
Python Setup and Usage	https://docs.python.org/3/using/index.html
2. Using Python on Unix platforms	https://docs.python.org/3/using/unix.html
Report a bug	https://docs.python.org/3/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/using/cmdline.rst?plain=1
index	https://docs.python.org/3/genindex.html
modules	https://docs.python.org/3/py-modindex.html
next	https://docs.python.org/3/using/unix.html
previous	https://docs.python.org/3/using/index.html
Python	https://www.python.org/
3.14.2 Documentation	https://docs.python.org/3/index.html
Python Setup and Usage	https://docs.python.org/3/using/index.html
1. Command line and environment	https://docs.python.org/3/using/cmdline.html
Copyright	https://docs.python.org/3/copyright.html
History and License	https://docs.python.org/license.html
Please donate.	https://www.python.org/psf/donations/
Found a bug	https://docs.python.org/bugs.html
Sphinx	https://www.sphinx-doc.org/

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