paul j3 added the comment:
Attached is a patch for 3.5.0 dev that adds UsageGroups. Now different 'kinds'
are implemented as subclasses, which are accessed via the registry:
_XorUsageGroup - replicate action of MutuallyExclusiveGroups
_AndUsageGroup - an inclusive group
_OrUsageGroup - an 'any' group
_NorUsageGroup - NotOr - also works as Not
_NandUsageGroup - NotAnd
Open issues:
- what difference should the 'required' parameter make?
- how should 'errors' in nested groups propagate?
- formatting of error messages
- formatting the usage line with these groups
- any additional 'help' display
- framework for custom test and/or subclasses
- documentation, sample scripts, and formal testing
----------
Added file: http://bugs.python.org/file36553/usage_2.patch
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<http://bugs.python.org/issue11588>
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