argh.py

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('args', nargs='*')  # from __init__.py execute()
parser.add_argument('args', nargs='+')  # from base.py LabelCommand add_arguments
print(parser.parse_args(['foo1', 'foo2', 'foo3', 'foo4']))

# Outputs Namespace(args=['foo4'])

I don't understand how it works, but it's cool!