[Python] Is "if __name__ == '__main__'" required in a __main__.py?

In a project that has a __main__.py, rather than

# __main__.py
# def main...

if __name__ == "__main__":
main()


...is it OK to just do:

# __main__.py
# def main...

main()


Edit:

@user2357112-supports-Monica's argument made a lot of sense to me, so I went back and tracked down the library that had been giving me issues, causing me to still be adding the if __... line. It's upon calling python -m pytest --doctest-modules.

Maybe that's the only place that makes a mistake in running __main__.py? And maybe that's a bug?

Reproduced by putting the first example in the docs in a __main__.py:

――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― package/__main__.py ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
package/__main__.py:58: in <module>
args = parser.parse_args()
/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py:1755: in parse_args
args, argv = self.parse_known_args(args, namespace)
/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py:1787: in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py:2022: in _parse_known_args
', '.join(required_actions))
/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py:2508: in error
self.exit(2, _('%(prog)s: error: %(message)s\n') % args)
/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py:2495: in exit
_sys.exit(status)
E SystemExit: 2
--------------------------------------------------------------------------------------- Captured stderr ---------------------------------------------------------------------------------------
usage: pytest.py [-h] [--sum] N [N ...]
pytest.py: error: the following arguments are required: N

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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