Jeff Knupp added the comment:

This is not a bug.

The 'PARSER' nargs choice is an implementation detail as a way to handle 
subparsers. The parser needs to know that the first value should be handled, 
but everything that follows will be handled by the subparser.

By using a subparser, you're effectively using 'PARSER', but it wouldn't make 
sense to allow 'PARSER' to be set directly as it only makes sense when used in 
conjunction with a subparser.

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nosy: +jeffknupp

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16988>
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