New submission from gaborbernat <[email protected]>:
Consider the following code:
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument("--clear-magic", action="store_true")
print(parser.parse_args(["--clear"]))
parser.add_argument("--clear", action="store_true")
print(parser.parse_args(["--clear"]))
This has the following output:
Namespace(clear_magic=True)
Namespace(clear=True, clear_magic=False)
I find it surprising and confusing why the clear magic option is accepted when
clear is not defined. I'm tempted to say it's a bug. This unstable behaviour is
very surprising when iteratively building up the parser.
Discovered with
https://github.com/pypa/virtualenv/issues/1824#issuecomment-627919033
----------
messages: 368776
nosy: gaborbernat
priority: normal
severity: normal
status: open
title: argparse
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Python tracker <[email protected]>
<https://bugs.python.org/issue40615>
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