[New-bugs-announce] [issue41255] Argparse.parse_args exits on unrecognized option with exit_on_error=False

[Matthew Hughes]

New submission from Matthew Hughes <matthewhughes934 at gmail.com>:

>>> import argparse
    >>> parser = argparse.ArgumentParser(exit_on_error=False)
    >>> parser.parse_args(["--unknown"])
    usage: [-h]
    : error: unrecognized arguments: --unknown

The docs https://docs.python.org/3.10/library/argparse.html#exit-on-error say:

> Normally, when you pass an invalid argument list to the parse_args() method of an ArgumentParser, it will exit with error info.
> If the user would like catch errors manually, the feature can be enable by setting exit_on_error to False:

This description _appears_ to be at odds with the observed behavior.

----------
components: Library (Lib)
messages: 373382
nosy: mhughes
priority: normal
severity: normal
status: open
title: Argparse.parse_args exits on unrecognized option with exit_on_error=False
type: behavior
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41255>
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