New submission from Antony Lee <[email protected]>:
If one tries to add twice the same flag to an ArgumentParser, one gets a
helpful exception:
from argparse import ArgumentParser
p = ArgumentParser()
p.add_argument("--foo")
p.add_argument("--foo")
results in
argparse.ArgumentError: argument --foo: conflicting option string: --foo
However, adding twice the same subparser raises no exception:
from argparse import ArgumentParser
p = ArgumentParser()
sp = p.add_subparsers()
sp.add_parser("foo")
sp.add_parser("foo")
even though the two subparsers shadow one another in the same way as two
identical flags.
----------
components: Library (Lib)
messages: 362421
nosy: Antony.Lee
priority: normal
severity: normal
status: open
title: argparse.ArgumentParser does not raise on duplicated subparsers, even
though it does on duplicated flags
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue39716>
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