paul j3 added the comment: Here's a possible solution to the problem (assuming there really is one):
- redefine REMAINDER so it matches a '((?:A[AO]*)?)' pattern (where O is a string that looks like an optional flag, A an argument string). I've added the condition that the first match (if any) must be an A. It ends up being closer to the pattern for PARSER. I included a patch from issue 15112, which delays the consumption of a positional that matches with 0 strings. In the sample case for this issue, results with this patch are: args = parser.parse_args(['app', '--config', 'bar']) # Namespace(app='app', app_args=[], config='bar') args = parser.parse_args(['--config', 'bar', 'app']) # Namespace(app='app', app_args=[], config='bar') args = parser.parse_args(['app', 'args', '--config', 'bar']) # Namespace(app='app', app_args=['args', '--config', 'bar'], config=None) In the last case, 'app_args' gets the rest of the strings because the first is a plain 'args'. I believe this is consistent with the intuition expressed in this issue. I've added one test case to test_argparse.TestNargsRemainder. This is a TestCase that is similar to the above example. argument_signatures = [Sig('x'), Sig('y', nargs='...'), Sig('-z')] failures = ['', '-z', '-z Z'] successes = [ ('X', NS(x='X', y=[], z=None)), ('-z Z X', NS(x='X', y=[], z='Z')), ('X A B -z Z', NS(x='X', y=['A', 'B', '-z', 'Z'], z=None)), ('X Y --foo', NS(x='X', y=['Y', '--foo'], z=None)), ('X -z Z A B', NS(x='X', y=['A', 'B'], z='Z')), # new case ] This patch runs test_argparse fine. But there is a slight possibility that this patch will cause backward compatibility problems. Some user might expect y=['-z','Z',...]. But that expectation has not been enshrined the test_argparse. It may require a slight change to the documentation as well. ---------- keywords: +patch Added file: http://bugs.python.org/file35824/issue14174_1.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue14174> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com