I am currently writing a unittest script that requires argparser but since the unittest module already has a ArgumentParser instance, I cannot create and use my own ArgumentParser instance.


Possible solution:

The problem would be solved I could inherit the parent ArgumentParser instance created here:
https://github.com/python/cpython/blob/master/Lib/unittest/main.py#L162

Please let me know if it's feasible / acceptable to change `parent_parser` as `self.parent_parent` for inheritance.

I would love to create a pull request for it.