Anthony Sottile added the comment:

I've attempted to address some of the backward/forward compatibility issue with 
subparsers becoming optional by default (vs required by default in python2) 
with this pull request: https://github.com/python/cpython/pull/3027 (would love 
to get a review as well!)

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nosy: +Anthony Sottile

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<http://bugs.python.org/issue9253>
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