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July 13, 2020 18:50
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Diff of python --help over time
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| Python 2.7.10 | |
| usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ... | |
| Options and arguments (and corresponding environment variables): | |
| -B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| -c cmd : program passed in as string (terminates option list) | |
| -d : debug output from parser; 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 | |
| -m mod : run library module as a script (terminates option list) | |
| -O : optimize 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 arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew | |
| -s : don't add user site directory to sys.path; also PYTHONNOUSERSITE | |
| -S : don't imply 'import site' on initialization | |
| -t : issue warnings about inconsistent tab usage (-tt: issue errors) | |
| -u : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x | |
| see man page for details on internal buffering relating to '-u' | |
| -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) | |
| -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 | |
| -3 : warn about Python 3.x incompatibilities that 2to3 cannot trivially fix | |
| 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 <prefix> directory (or <prefix>:<exec_prefix>). | |
| The default module search path uses <prefix>/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| PYTHONIOENCODING: Encoding[: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. | |
| Python 2.7.14 | |
| *** | |
| --- | |
| *************** | |
| *** 2,3 **** | |
| --- 2,5 ---- | |
| Options and arguments (and corresponding environment variables): | |
| + -b : issue warnings about comparing bytearray with unicode | |
| + (-bb: issue errors) | |
| -B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| Python 2.7.7 | |
| *** | |
| --- | |
| *************** | |
| *** 2,5 **** | |
| Options and arguments (and corresponding environment variables): | |
| - -b : issue warnings about comparing bytearray with unicode | |
| - (-bb: issue errors) | |
| -B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| --- 2,3 ---- | |
| Python 3.2.6 | |
| *** | |
| --- | |
| *************** | |
| *** 2,3 **** | |
| --- 2,5 ---- | |
| 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 .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| *************** | |
| *** 12,20 **** | |
| -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 arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew | |
| -s : don't add user site directory to sys.path; also PYTHONNOUSERSITE | |
| -S : don't imply 'import site' on initialization | |
| - -t : issue warnings about inconsistent tab usage (-tt: issue errors) | |
| -u : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x | |
| --- 14,21 ---- | |
| -OO : remove doc-strings in addition to the -O optimizations | |
| + -q : don't print version and copyright messages on interactive startup | |
| -R : use a pseudo-random salt to make hash() values of various types be | |
| unpredictable between separate invocations of the interpreter, as | |
| ! a defence against denial-of-service attacks | |
| -s : don't add user site directory to sys.path; also PYTHONNOUSERSITE | |
| -S : don't imply 'import site' on initialization | |
| -u : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x | |
| *************** | |
| *** 27,29 **** | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -3 : warn about Python 3.x incompatibilities that 2to3 cannot trivially fix | |
| file : program read from script file | |
| --- 28,30 ---- | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -X opt : set implementation-specific option | |
| file : program read from script file | |
| Python 3.3.5 | |
| *** | |
| --- | |
| *************** | |
| *** 15,22 **** | |
| -q : don't print version and copyright messages on interactive startup | |
| - -R : use a pseudo-random salt to make hash() values of various types be | |
| - unpredictable between separate invocations of the interpreter, as | |
| - a defence against denial-of-service attacks | |
| -s : don't add user site directory to sys.path; also PYTHONNOUSERSITE | |
| -S : don't imply 'import site' on initialization | |
| ! -u : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x | |
| see man page for details on internal buffering relating to '-u' | |
| --- 15,20 ---- | |
| -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 : unbuffered binary stdout and stderr, stdin always buffered; | |
| ! also PYTHONUNBUFFERED=x | |
| see man page for details on internal buffering relating to '-u' | |
| *************** | |
| *** 41,45 **** | |
| PYTHONIOENCODING: Encoding[: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. | |
| --- 39,44 ---- | |
| 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, 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. | |
| Python 3.4.1 | |
| *** | |
| --- | |
| *************** | |
| *** 11,12 **** | |
| --- 11,13 ---- | |
| 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) | |
| Python 3.5.4 | |
| *** | |
| --- | |
| *************** | |
| *** 4,6 **** | |
| and comparing bytes/bytearray with str. (-bb: issue errors) | |
| ! -B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| -c cmd : program passed in as string (terminates option list) | |
| --- 4,6 ---- | |
| 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) | |
| Python 3.6.0 | |
| *** | |
| --- | |
| *************** | |
| *** 4,6 **** | |
| 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) | |
| --- 4,6 ---- | |
| and comparing bytes/bytearray with str. (-bb: issue errors) | |
| ! -B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| -c cmd : program passed in as string (terminates option list) | |
| *************** | |
| *** 24,25 **** | |
| --- 24,26 ---- | |
| -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 | |
| *************** | |
| *** 45 **** | |
| --- 46,49 ---- | |
| predictable seed. | |
| + PYTHONMALLOC: set the Python memory allocators and/or install debug hooks | |
| + on Python memory allocators. Use PYTHONMALLOC=debug to install debug | |
| + hooks. | |
| Python 3.6.0a2 | |
| *** | |
| --- | |
| *************** | |
| *** 24,26 **** | |
| -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 | |
| --- 24,25 ---- | |
| Python 3.6.0b4 | |
| *** | |
| --- | |
| *************** | |
| *** 24,25 **** | |
| --- 24,26 ---- | |
| -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 | |
| Python 3.6.10 | |
| *** | |
| --- | |
| *************** | |
| *** 4,6 **** | |
| and comparing bytes/bytearray with str. (-bb: issue errors) | |
| ! -B : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x | |
| -c cmd : program passed in as string (terminates option list) | |
| --- 4,6 ---- | |
| 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) | |
| *************** | |
| *** 13,16 **** | |
| -m mod : run library module as a script (terminates option list) | |
| ! -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x | |
| ! -OO : remove doc-strings in addition to the -O optimizations | |
| -q : don't print version and copyright messages on interactive startup | |
| --- 13,18 ---- | |
| -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 | |
| *************** | |
| *** 18,22 **** | |
| -S : don't imply 'import site' on initialization | |
| ! -u : unbuffered binary stdout and stderr, stdin always buffered; | |
| also PYTHONUNBUFFERED=x | |
| - see man page for details on internal buffering relating to '-u' | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| --- 20,24 ---- | |
| -S : don't imply 'import site' on initialization | |
| ! -u : force the binary I/O layers of stdout and stderr to be unbuffered; | |
| ! stdin is always buffered; text I/O layer will be line-buffered; | |
| also PYTHONUNBUFFERED=x | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| *************** | |
| *** 38,40 **** | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| --- 40,42 ---- | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/lib/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| Python 3.6.2 | |
| *** | |
| --- | |
| *************** | |
| *** 13,18 **** | |
| -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 | |
| --- 13,16 ---- | |
| -m mod : run library module as a script (terminates option list) | |
| ! -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x | |
| ! -OO : remove doc-strings in addition to the -O optimizations | |
| -q : don't print version and copyright messages on interactive startup | |
| *************** | |
| *** 20,24 **** | |
| -S : don't imply 'import site' on initialization | |
| ! -u : force the binary I/O layers of stdout and stderr to be unbuffered; | |
| ! stdin is always buffered; text I/O layer will be line-buffered; | |
| also PYTHONUNBUFFERED=x | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| --- 18,22 ---- | |
| -S : don't imply 'import site' on initialization | |
| ! -u : unbuffered binary stdout and stderr, stdin always buffered; | |
| also PYTHONUNBUFFERED=x | |
| + see man page for details on internal buffering relating to '-u' | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| *************** | |
| *** 40,42 **** | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/lib/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| --- 38,40 ---- | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| Python 3.6.4 | |
| *** | |
| --- | |
| *************** | |
| *** 18,22 **** | |
| -S : don't imply 'import site' on initialization | |
| ! -u : unbuffered binary stdout and stderr, stdin always buffered; | |
| also PYTHONUNBUFFERED=x | |
| - see man page for details on internal buffering relating to '-u' | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| --- 18,22 ---- | |
| -S : don't imply 'import site' on initialization | |
| ! -u : force the binary I/O layers of stdout and stderr to be unbuffered; | |
| ! stdin is always buffered; text I/O layer will be line-buffered; | |
| also PYTHONUNBUFFERED=x | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| *************** | |
| *** 38,40 **** | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| --- 38,40 ---- | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/lib/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| Python 3.6.5 | |
| *** | |
| --- | |
| *************** | |
| *** 13,16 **** | |
| -m mod : run library module as a script (terminates option list) | |
| ! -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x | |
| ! -OO : remove doc-strings in addition to the -O optimizations | |
| -q : don't print version and copyright messages on interactive startup | |
| --- 13,18 ---- | |
| -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 | |
| Python 3.7.0 | |
| *** | |
| --- | |
| *************** | |
| *** 20,24 **** | |
| -S : don't imply 'import site' on initialization | |
| ! -u : force the binary I/O layers of stdout and stderr to be unbuffered; | |
| ! stdin is always buffered; text I/O layer will be line-buffered; | |
| ! also PYTHONUNBUFFERED=x | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| --- 20,23 ---- | |
| -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 | |
| *************** | |
| *** 31,32 **** | |
| --- 30,33 ---- | |
| -X opt : set implementation-specific option | |
| + --check-hash-based-pycs always|default|never: | |
| + control how Python invalidates hash-based .pyc files | |
| file : program read from script file | |
| *************** | |
| *** 51 **** | |
| --- 52,56 ---- | |
| 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. | |
| + PYTHONDEVMODE: enable the development mode. | |
| Python 3.7.0a1 | |
| *** | |
| --- | |
| *************** | |
| *** 13,18 **** | |
| -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 | |
| --- 13,16 ---- | |
| -m mod : run library module as a script (terminates option list) | |
| ! -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x | |
| ! -OO : remove doc-strings in addition to the -O optimizations | |
| -q : don't print version and copyright messages on interactive startup | |
| *************** | |
| *** 20,23 **** | |
| -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 | |
| --- 18,22 ---- | |
| -S : don't imply 'import site' on initialization | |
| ! -u : unbuffered binary stdout and stderr, stdin always buffered; | |
| ! also PYTHONUNBUFFERED=x | |
| ! see man page for details on internal buffering relating to '-u' | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| *************** | |
| *** 30,33 **** | |
| -X opt : set implementation-specific option | |
| - --check-hash-based-pycs always|default|never: | |
| - control how Python invalidates hash-based .pyc files | |
| file : program read from script file | |
| --- 29,30 ---- | |
| *************** | |
| *** 41,43 **** | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/lib/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| --- 38,40 ---- | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| *************** | |
| *** 55,56 **** | |
| locale coercion and locale compatibility warnings on stderr. | |
| - PYTHONDEVMODE: enable the development mode. | |
| --- 52 ---- | |
| Python 3.7.0a2 | |
| *** | |
| --- | |
| *************** | |
| *** 18,22 **** | |
| -S : don't imply 'import site' on initialization | |
| ! -u : unbuffered binary stdout and stderr, stdin always buffered; | |
| ! also PYTHONUNBUFFERED=x | |
| ! see man page for details on internal buffering relating to '-u' | |
| -v : verbose (trace import statements); also PYTHONVERBOSE=x | |
| --- 18,21 ---- | |
| -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 | |
| Python 3.7.0a3 | |
| *** | |
| --- | |
| *************** | |
| *** 37,39 **** | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| --- 37,39 ---- | |
| PYTHONHOME : alternate <prefix> directory (or <prefix>:<exec_prefix>). | |
| ! The default module search path uses <prefix>/lib/pythonX.X. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). | |
| *************** | |
| *** 51 **** | |
| --- 51,52 ---- | |
| locale coercion and locale compatibility warnings on stderr. | |
| + PYTHONDEVMODE: enable the development mode. | |
| Python 3.7.0a4 | |
| *** | |
| --- | |
| *************** | |
| *** 28,29 **** | |
| --- 28,31 ---- | |
| -X opt : set implementation-specific option | |
| + --check-hash-based-pycs always|default|never: | |
| + control how Python invalidates hash-based .pyc files | |
| file : program read from script file | |
| Python 3.7.0b2 | |
| *** | |
| --- | |
| *************** | |
| *** 13,16 **** | |
| -m mod : run library module as a script (terminates option list) | |
| ! -O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x | |
| ! -OO : remove doc-strings in addition to the -O optimizations | |
| -q : don't print version and copyright messages on interactive startup | |
| --- 13,18 ---- | |
| -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 | |
| Python 3.7.1 | |
| *** | |
| --- | |
| *************** | |
| *** 55,56 **** | |
| --- 55,58 ---- | |
| 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. | |
| Python 3.7.6 | |
| *** | |
| --- | |
| *************** | |
| *** 43,44 **** | |
| --- 43,45 ---- | |
| 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. | |
| Python 3.7.7 | |
| *** | |
| --- | |
| *************** | |
| *** 29,31 **** | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -X opt : set implementation-specific option | |
| --check-hash-based-pycs always|default|never: | |
| --- 29,59 ---- | |
| -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 showalloccount: output the total count of allocated objects for each | |
| ! type when the program finishes. This only works when Python was built with | |
| ! COUNT_ALLOCS defined | |
| ! -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 | |
| ! -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) | |
| ! | |
| --check-hash-based-pycs always|default|never: | |
| Python 3.8.0 | |
| *** | |
| --- | |
| *************** | |
| *** 29,59 **** | |
| -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 showalloccount: output the total count of allocated objects for each | |
| ! type when the program finishes. This only works when Python was built with | |
| ! COUNT_ALLOCS defined | |
| ! -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 | |
| ! -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) | |
| ! | |
| --check-hash-based-pycs always|default|never: | |
| --- 29,31 ---- | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -X opt : set implementation-specific option | |
| --check-hash-based-pycs always|default|never: | |
| *************** | |
| *** 71,73 **** | |
| 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. | |
| --- 43,44 ---- | |
| *************** | |
| *** 75,78 **** | |
| PYTHONHASHSEED: if this variable is set to 'random', 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. | |
| --- 46,49 ---- | |
| 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. | |
| *************** | |
| *** 87 **** | |
| --- 58,59 ---- | |
| PYTHONDEVMODE: enable the development mode. | |
| + PYTHONPYCACHEPREFIX: root directory for bytecode cache (pyc) files. | |
| Python 3.8.0a1 | |
| *** | |
| --- | |
| *************** | |
| *** 46,49 **** | |
| 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. | |
| --- 46,49 ---- | |
| PYTHONHASHSEED: if this variable is set to 'random', 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. | |
| Python 3.8.0b4 | |
| *** | |
| --- | |
| *************** | |
| *** 46,49 **** | |
| PYTHONHASHSEED: if this variable is set to 'random', 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. | |
| --- 46,49 ---- | |
| 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. | |
| Python 3.8.1 | |
| *** | |
| --- | |
| *************** | |
| *** 43,44 **** | |
| --- 43,45 ---- | |
| 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. | |
| Python 3.8.2 | |
| *** | |
| --- | |
| *************** | |
| *** 29,31 **** | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -X opt : set implementation-specific option | |
| --check-hash-based-pycs always|default|never: | |
| --- 29,62 ---- | |
| -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 showalloccount: output the total count of allocated objects for each | |
| ! type when the program finishes. This only works when Python was built with | |
| ! COUNT_ALLOCS defined | |
| ! -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 | |
| ! | |
| --check-hash-based-pycs always|default|never: | |
| Python 3.9.0a1 | |
| *** | |
| --- | |
| *************** | |
| *** 29,62 **** | |
| -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 showalloccount: output the total count of allocated objects for each | |
| ! type when the program finishes. This only works when Python was built with | |
| ! COUNT_ALLOCS defined | |
| ! -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 | |
| ! | |
| --check-hash-based-pycs always|default|never: | |
| --- 29,31 ---- | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -X opt : set implementation-specific option | |
| --check-hash-based-pycs always|default|never: | |
| *************** | |
| *** 74,76 **** | |
| 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. | |
| --- 43,44 ---- | |
| Python 3.9.0a2 | |
| *** | |
| --- | |
| *************** | |
| *** 43,44 **** | |
| --- 43,45 ---- | |
| 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. | |
| Python 3.9.0a3 | |
| *** | |
| --- | |
| *************** | |
| *** 29,31 **** | |
| -x : skip first line of source, allowing use of non-Unix forms of #!cmd | |
| ! -X opt : set implementation-specific option | |
| --check-hash-based-pycs always|default|never: | |
| --- 29,62 ---- | |
| -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 showalloccount: output the total count of allocated objects for each | |
| ! type when the program finishes. This only works when Python was built with | |
| ! COUNT_ALLOCS defined | |
| ! -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 | |
| ! | |
| --check-hash-based-pycs always|default|never: | |
| Python 3.9.0a4 | |
| *** | |
| --- | |
| *************** | |
| *** 39,43 **** | |
| traceback limit of NFRAME frames | |
| - -X showalloccount: output the total count of allocated objects for each | |
| - type when the program finishes. This only works when Python was built with | |
| - COUNT_ALLOCS defined | |
| -X importtime: show how long each import takes. It shows module name, | |
| --- 39,40 ---- | |
| Python 3.9.0a6 | |
| *** | |
| --- | |
| *************** | |
| *** 32,33 **** | |
| --- 32,34 ---- | |
| -X faulthandler: enable faulthandler | |
| + -X oldparser: enable the traditional LL(1) parser; also PYTHONOLDPARSER | |
| -X showrefcount: output the total reference count and number of used | |
| Python 3.9.0b2 | |
| *** | |
| --- | |
| *************** | |
| *** 71,72 **** | |
| --- 71,73 ---- | |
| The default module search path uses <prefix>/lib/pythonX.X. | |
| + PYTHONPLATLIBDIR : override sys.platlibdir. | |
| PYTHONCASEOK : ignore case in 'import' statements (Windows). |
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