paul j3 added the comment:
There's another 'feature' to the patch proposed here. It only deletes the
first '--' in the list of strings passed to '_get_values' for a particular
action.
parser = argparse.ArgumentParser()
parser.add_argument('foo')
parser.add_argument('bar', nargs='*')
print(parser.parse_args('-- 1 -- 2 3 4'.split(' ')))
# Namespace(bar=['2', '3', '4'], foo='1')
'_get_values' first gets ('foo',['--','1']), then ('bar',['--','2','3','4'])
print(parser.parse_args('-- -- 1 -- 2 -- 3 4'.split(' ')))
# with this '1st only' change
# Namespace(bar=['1', '2', '--', '3', '4'], foo='--')
# without it, deleting all '--'; note foo is empty
# Namespace(bar=['1', '2', '3', '4'], foo=[])
And to confuse things a bit more:
print(parser.parse_args('1 -- 2 3 4'.split(' ')))
# Namespace(bar=['2', '3', '4'], foo='1')
passes ['1','--'] with 'foo'
If 'bar' nargs='...', bar gets all of the '--' (with or without this patch).
The handling of '--' is complex because it is used in one place to mean,
'everything else is an argument', effectively adding '-AA...' to the
arg_strings_pattern. It also matches with the nargs_pattern (e.g.
'(-*A-*)...'). And then it may or may not be removed in _get_values().
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13922>
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