Jeff Knupp added the comment:
The only time this would be an issue is for infinite sequences via range or a
generator, which doesn't work anyway.
>>> p = argparse.ArgumentParser()
>>> a = p.add_argument('a', choices=itertools.count(0), type=int)
>>> p.parse_args(['10000'])
... hangs
Are there any other cases where coercing to a list wouldn't work?
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<http://bugs.python.org/issue16977>
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