-X faulthandler: dump the Python traceback on fatal errors;\n\
also PYTHONFAULTHANDLER\n\
-X frozen_modules=[on|off]: whether to use frozen modules; the default is \"on\"\n\
- for installed Python and \"off\" for a local build;\n\
- also PYTHON_FROZEN_MODULES\n\
+ for installed Python and \"off\" for a local build\n\
-X importtime: show how long each import takes; also PYTHONPROFILEIMPORTTIME\n\
-X int_max_str_digits=N: limit the size of int<->str conversions;\n\
0 disables the limit; also PYTHONINTMAXSTRDIGITS\n\