argparse to validated unknown args in python

Question

test1.py:

_argParserObj = argparse.ArgumentParser()
_argParserObj.add_argument('--tool', type=str, dest='tool')
parsedArgs, passthroughs = _argParserObj.parse_known_args()

When test1.py is executed as below

test1.py --tool abc arg1 arg2 --invalid_switch

I would like to show the below error. But still accept arg1 and arg2 as extra arguments

test1.py: error: unrecognized arguments: -invalid_switch

Currently it just parses invalid_switch also a passthrough and throw any error.

Can anyone please suggest how to achieve this?

Answer 1

You can try parse_args() instead of parse_known_args()

_argParserObj = argparse.ArgumentParser()
_argParserObj.add_argument('--tool', type=str, dest='tool')
parsedArgs, passthroughs = _argParserObj.parse_args()

parse_args() will show this error in your case

test.py: error: unrecognized arguments: --invalid_switch