gh-90300: Document equivalent -X options for envvars in the Python CLI help (GH-116756)

Author: serhiy-storchaka

Python/initconfig.c

@@ -259,18 +259,11 @@ static const char usage_envvars[] =
 "                  The default module search path uses %s.\n"
 "PYTHONPLATLIBDIR: override sys.platlibdir.\n"
 "PYTHONCASEOK    : ignore case in 'import' statements (Windows).\n"
-"PYTHONUTF8      : if set to 1, enable the UTF-8 mode.\n"
 "PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.\n"
-"PYTHONFAULTHANDLER: dump the Python traceback on fatal errors.\n"
 "PYTHONHASHSEED  : if this variable is set to 'random', a random value is used\n"
 "                  to seed the hashes of str and bytes objects.  It can also be\n"
 "                  set to an integer in the range [0,4294967295] to get hash\n"
 "                  values with a predictable seed.\n"
-"PYTHONINTMAXSTRDIGITS: limits the maximum digit characters in an int value\n"
-"                  when converting from a string and when converting an int\n"
-"                  back to a str.  A value of 0 disables the limit.\n"
-"                  Conversions to or from bases 2, 4, 8, 16, and 32 are never\n"
-"                  limited.\n"
 "PYTHONMALLOC    : set the Python memory allocators and/or install debug hooks\n"
 "                  on Python memory allocators.  Use PYTHONMALLOC=debug to\n"
 "                  install debug hooks.\n"
@@ -281,47 +274,56 @@ static const char usage_envvars[] =
 "PYTHONBREAKPOINT: if this variable is set to 0, it disables the default\n"
 "                  debugger.  It can be set to the callable of your debugger of\n"
 "                  choice.\n"
-"PYTHON_CPU_COUNT: Overrides the return value of os.process_cpu_count(),\n"
-"                  os.cpu_count(), and multiprocessing.cpu_count() if set to\n"
-"                  a positive integer.\n"
-#ifdef Py_GIL_DISABLED
-"PYTHON_GIL      : When set to 0, disables the GIL.\n"
-#endif
-"PYTHONDEVMODE   : enable the development mode.\n"
-"PYTHONPYCACHEPREFIX: root directory for bytecode cache (pyc) files.\n"
-"PYTHONWARNDEFAULTENCODING: enable opt-in EncodingWarning for 'encoding=None'.\n"
-"PYTHONNODEBUGRANGES: if this variable is set, it disables the inclusion of\n"
-"                  the tables mapping extra location information (end line,\n"
-"                  start column offset and end column offset) to every\n"
-"                  instruction in code objects.  This is useful when smaller\n"
-"                  code objects and pyc files are desired as well as\n"
-"                  suppressing the extra visual location indicators when the\n"
-"                  interpreter displays tracebacks.\n"
-"PYTHON_FROZEN_MODULES: if this variable is set, it determines whether or not\n"
-"                  frozen modules should be used.  The default is \"on\" (or\n"
-"                  \"off\" if you are running a local build).\n"
 "PYTHON_COLORS   : if this variable is set to 1, the interpreter will colorize\n"
 "                  various kinds of output.  Setting it to 0 deactivates\n"
 "                  this behavior.\n"
 "PYTHON_HISTORY  : the location of a .python_history file.\n"
 "\n"
 "These variables have equivalent command-line options (see --help for details):\n"
+"PYTHON_CPU_COUNT: Overrides the return value of os.process_cpu_count(),\n"
+"                  os.cpu_count(), and multiprocessing.cpu_count() if set to\n"
+"                  a positive integer. (-X cpu_count)\n"
 "PYTHONDEBUG     : enable parser debug mode (-d)\n"
+"PYTHONDEVMODE   : enable the development mode (-X dev)\n"
 "PYTHONDONTWRITEBYTECODE: don't write .pyc files (-B)\n"
+"PYTHONFAULTHANDLER: dump the Python traceback on fatal errors (-X faulthandler)\n"
+"PYTHON_FROZEN_MODULES: if this variable is set, it determines whether or not\n"
+"                  frozen modules should be used.  The default is \"on\" (or\n"
+"                  \"off\" if you are running a local build).\n"
+"                  (-X frozen_modules)\n"
+#ifdef Py_GIL_DISABLED
+"PYTHON_GIL      : when set to 0, disables the GIL (-X gil)\n"
+#endif
 "PYTHONINSPECT   : inspect interactively after running script (-i)\n"
-"PYTHONINTMAXSTRDIGITS: limit max digit characters in an int value\n"
+"PYTHONINTMAXSTRDIGITS: limits the maximum digit characters in an int value\n"
+"                  when converting from a string and when converting an int\n"
+"                  back to a str.  A value of 0 disables the limit.\n"
+"                  Conversions to or from bases 2, 4, 8, 16, and 32 are never\n"
+"                  limited.\n"
 "                  (-X int_max_str_digits=number)\n"
+"PYTHONNODEBUGRANGES: if this variable is set, it disables the inclusion of\n"
+"                  the tables mapping extra location information (end line,\n"
+"                  start column offset and end column offset) to every\n"
+"                  instruction in code objects.  This is useful when smaller\n"
+"                  code objects and pyc files are desired as well as\n"
+"                  suppressing the extra visual location indicators when the\n"
+"                  interpreter displays tracebacks. (-X no_debug_ranges)\n"
 "PYTHONNOUSERSITE: disable user site directory (-s)\n"
 "PYTHONOPTIMIZE  : enable level 1 optimizations (-O)\n"
 #ifdef Py_DEBUG
-"PYTHON_PRESITE=pkg.mod: import this module before site.py is run\n"
+"PYTHON_PRESITE=pkg.mod: import this module before site.py is run (-X presite)\n"
 #endif
+"PYTHONPYCACHEPREFIX: root directory for bytecode cache (pyc) files\n"
+"                  (-X pycache_prefix)\n"
 "PYTHONSAFEPATH  : don't prepend a potentially unsafe path to sys.path.\n"
 #ifdef Py_STATS
-"PYTHONSTATS     : turns on statistics gathering\n"
+"PYTHONSTATS     : turns on statistics gathering (-X pystats)\n"
 #endif
 "PYTHONUNBUFFERED: disable stdout/stderr buffering (-u)\n"
+"PYTHONUTF8      : if set to 1, enable the UTF-8 mode (-X utf8)\n"
 "PYTHONVERBOSE   : trace import statements (-v)\n"
+"PYTHONWARNDEFAULTENCODING: enable opt-in EncodingWarning for 'encoding=None'\n"
+"                  (-X warn_default_encoding)\n"
 "PYTHONWARNINGS=arg: warning control (-W arg)\n"
 ;