New help options for CPython 3.11+

python --help

usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options (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)
--check-hash-based-pycs always|default|never :
         control how Python invalidates hash-based .pyc files
-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)
--help-env      : print help about Python environment variables and exit
--help-xoptions : print help about implementation-specific -X options and exit
--help-all      : print complete help information and exit
-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
-P     : don't prepend a potentially unsafe path to sys.path
-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
Arguments:
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:]

python --help-all

usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options (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)
--check-hash-based-pycs always|default|never :
         control how Python invalidates hash-based .pyc files
-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)
--help-env      : print help about Python environment variables and exit
--help-xoptions : print help about implementation-specific -X options and exit
--help-all      : print complete help information and exit
-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
-P     : don't prepend a potentially unsafe path to sys.path
-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
Arguments:
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:]


Environment variables that change behavior:
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.
PYTHONSAFEPATH: don't prepend a potentially unsafe path to sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>:<exec_prefix>).
               The default module search path uses <prefix>/lib/pythonX.X.
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'.
PYTHONNODEBUGRANGES: If this variable is set, it disables the inclusion of the 
   tables mapping extra location information (end line, start column offset 
   and end column offset) to every instruction in code objects. This is useful 
   when smaller code objects and pyc files are desired as well as suppressing the 
   extra visual location indicators when the interpreter displays tracebacks.

These variables have equivalent command-line parameters (see --help for details):
PYTHONDEBUG             : enable parser debug mode (-d)
PYTHONDONTWRITEBYTECODE : don't write .pyc files (-B)
PYTHONINSPECT           : inspect interactively after running script (-i)
PYTHONNOUSERSITE        : disable user site directory (-s)
PYTHONOPTIMIZE          : enable level 1 optimizations (-O)
PYTHONUNBUFFERED        : disable stdout/stderr buffering (-u)
PYTHONVERBOSE           : trace import statements (-v)
PYTHONWARNINGS=arg      : warning control (-W arg)


The following implementation-specific 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'

-X no_debug_ranges: disable the inclusion of the tables mapping extra location 
   information (end line, start column offset and end column offset) to every 
   instruction in code objects. This is useful when smaller code objects and pyc 
   files are desired as well as suppressing the extra visual location indicators 
   when the interpreter displays tracebacks.

-X frozen_modules=[on|off]: whether or not frozen modules should be used.
   The default is "on" (or "off" if you are running a local build).

python --help-env

Environment variables that change behavior:
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.
PYTHONSAFEPATH: don't prepend a potentially unsafe path to sys.path.
PYTHONHOME   : alternate <prefix> directory (or <prefix>:<exec_prefix>).
               The default module search path uses <prefix>/lib/pythonX.X.
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'.
PYTHONNODEBUGRANGES: If this variable is set, it disables the inclusion of the 
   tables mapping extra location information (end line, start column offset 
   and end column offset) to every instruction in code objects. This is useful 
   when smaller code objects and pyc files are desired as well as suppressing the 
   extra visual location indicators when the interpreter displays tracebacks.

These variables have equivalent command-line parameters (see --help for details):
PYTHONDEBUG             : enable parser debug mode (-d)
PYTHONDONTWRITEBYTECODE : don't write .pyc files (-B)
PYTHONINSPECT           : inspect interactively after running script (-i)
PYTHONNOUSERSITE        : disable user site directory (-s)
PYTHONOPTIMIZE          : enable level 1 optimizations (-O)
PYTHONUNBUFFERED        : disable stdout/stderr buffering (-u)
PYTHONVERBOSE           : trace import statements (-v)
PYTHONWARNINGS=arg      : warning control (-W arg)

python --help-xoptions

The following implementation-specific 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'

-X no_debug_ranges: disable the inclusion of the tables mapping extra location 
   information (end line, start column offset and end column offset) to every 
   instruction in code objects. This is useful when smaller code objects and pyc 
   files are desired as well as suppressing the extra visual location indicators 
   when the interpreter displays tracebacks.

-X frozen_modules=[on|off]: whether or not frozen modules should be used.
   The default is "on" (or "off" if you are running a local build).

Man page: