5 1.1. Command line Python Setup and Usage, Release 3.9.5 $_{-I}$option can be used to run the script in isolated mode where$_{sys.path}$ contains neither the script’s direc- tory nor the user’s site-packages directory. All PYTHON* environment variables are ignored, too. Raises an auditing event$_{cpython.run_file}$ with argument$_{filename}$ . See also: runpy.run_path() Equivalent functionality directly available to Python code If no interface option is given,$_{-i}$is implied,$_{sys.argv[0]}$ is an empty string ($_{""}$ ) and the current directory will be added to the start of sys.path . Also, tab-completion and history editing is automatically enabled, if available on your platform (see rlcompleter-config). See also: tut-invoking Changed in version 3.4: Automatic enabling of tab-completion and history editing. 1.1.2 Generic options 1.1.3 Miscellaneous options The semantics of timestamp-based$_{.pyc}$ files are unaffected by this option. Control the validation behavior of hash-based$_{.pyc}$files. See pyc-invalidation. When set to$_{default}$ , checked and unchecked hash-based bytecode cache files are validated according to their default semantics. When set to$_{always}$ , all hash-based$_{.pyc}$ files, whether checked or unchecked, are validated against their corresponding source file. When set to$_{never}$, hash-based$_{.pyc}$ files are not validated against their corre- sponding source files. If given, Python won’t try to write $_{.pyc}$files on the import of source modules. See also PYTHONDONTWRITEBYTECODE . Changed in version 3.5: Affects comparisons of$_{bytes}$with$_{int}$. Issue a warning when comparing$_{bytes}$or$_{bytearray}$with$_{str}$or$_{bytes}$with$_{int}$. Issue an error when the option is given twice ($_{-bb}$ ). New in version 3.6: The$_{-VV}$option. When given twice, print more information about the build, like: Print the Python version number and exit. Example output could be: Print a short description of all command line options. -V --version --help -h -? -b -B --check-hash-based-pycs default|always|never Python 3.8.0b2+ Python 3.8.0b2+ (3.8:0c076caaa8, Apr 20 2019, 21:55:00) [GCC 6.2.0 20161005]