[New-bugs-announce] [issue32756] argparse: parse_known_args: raising exception on unknown arg following known one

[Yauhen]

New submission from Yauhen <actionless.loveless at gmail.com>:

steps to reproduce:

    import argparse
    import sys
    
    parser = argparse.ArgumentParser(prog=sys.argv[0], add_help=False)
    parser.add_argument('-a', action='store_true')
    parsed_args, unknown_args = parser.parse_known_args(sys.argv[1:])
    print(parsed_args)
    print(unknown_args)


Expected result:

$ python arparse_test.py -ab
Namespace(a=True)
['b']


Actual result:

$ python arparse_test.py -ab
usage: arparse_test.py [-a]
arparse_test.py: error: argument -a: ignored explicit argument 'b'

----------
components: Library (Lib)
messages: 311546
nosy: actionless
priority: normal
pull_requests: 5345
severity: normal
status: open
title: argparse: parse_known_args: raising exception on unknown arg following known one
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32756>
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