[New-bugs-announce] [issue15433] argparse usage line is wrong

[Reinis Ivanovs]

New submission from Reinis Ivanovs <dabas at untu.ms>:

I set a positional argument and an optional argument that accepts a list:

> parser = argparse.ArgumentParser()
> parser.add_argument('foo')
> parser.add_argument('-bar', nargs='*')

The usage line I get from --help is this:

> $ example.py --help
> usage: example.py [-h] [-bar [BAR [BAR ...]]] foo

Trying to actually follow the usage instructions produces this error:

> $ example.py -bar x y z
> error: too few arguments

Reversing the argument order works however:

> $ example.py z -bar x y

So the usage instructions are clearly wrong.

----------
components: Library (Lib)
messages: 166217
nosy: reinis
priority: normal
severity: normal
status: open
title: argparse usage line is wrong
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15433>
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