[Python] In python argparse package when adding "formatter_class" MetavarTypeHelpFormatter the...

I'm using the python package argparse, with simple configuration

When I try to add to my parser formatter_class=argparse.MetavarTypeHelpFormatter I get error:

AttributeError: 'NoneType' object has no attribute '__name__'


did anyone else encounter that? and maybe know why?

this is my code:

import argparse

argParser = argparse.ArgumentParser(
formatter_class=argparse.MetavarTypeHelpFormatter
)

argParser.add_argument("models", default='', nargs='+',
help="Which model(s) to execute")


args = argParser.parse_args()
print(args)


When I try it with out adding the formatter_class it is working It is also working with other formatter class like formatter_class=argparse.RawDescriptionHelpFormatter

I also tried it with prog attribute and without

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