Python argparse type and choice restrictions with nargs > 1

Question

The title pretty much says it all. If I have nargs greater than 1, is there any way I can set restrictions (such as choice/type) on the individual args parsed?

This

Answer 1

A caller of a Action class only catch a ArgumentError.

https://github.com/python/cpython/blob/3.8/Lib/argparse.py#L1805

For expecting to catch an exception by a caller, You should raise as following in your custom action.

raise ArgumentError(self, 'invalid subject {s!r}'.format(s=subject))