[issue7636] Add a set update action to optparse

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

The name should probably be "add" rather than "update", sticking with the name of the action being done on the underlying set (as update takes an iterable). Agree/disagree?

I need to add tests and docs to the patch I wrote up - I'll put it up here tomorrow.

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nosy: +brian.curtin

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<http://bugs.python.org/issue7636>
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