[issue13922] argparse handling multiple "--" in args improperly

[paul j3]

paul j3 added the comment:

This patch removes only one '--', the one that put a '-' in the 'arg_strings_pattern'.  It does this in 'consume_positionals' right before calling 'take_action'.  As before it does not do this if nargs is PARSER or REMAINDER.

test_argparse.py has two DoubleDashRemoval cases, that attempt to highlight the changes from production (delete all --) and development (delete first -- in each positional group) versions.

I have not made any changes to the documentation.  All it says now is:

"If you have positional arguments that must begin with - and don’t look like negative numbers, you can insert the pseudo-argument '--' which tells parse_args() that everything after that is a positional argument:"

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Added file: http://bugs.python.org/file29845/dbldash.patch

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<http://bugs.python.org/issue13922>
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