Python Command Line

Add a new command line option or new environment variable

Modify Python/initconfig.c to read the new environment variable. Example:

_Py_get_env_flag(use_env, &config->parser_debug, "PYTHONDEBUG");

Note: environment variable with a name starting with PYTHON are ignored when using -E or -I command line options.

Document the option in Doc/using/cmdline.rst. Example:

.. cmdoption:: -d

   Turn on parser debugging output (for expert only, depending on compilation
   options).  See also :envvar:`PYTHONDEBUG`.

Document the option in Python/initconfig.c usage string. Example:

-B     : don't write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x\n\

Document the new option the in the manual page Misc/python.man.

Add a test in Lib/test/test_cmd_line.py.