paul j3 added the comment:

http://bugs.python.org/issue29670
argparse: does not respect required args pre-populated into namespace

wants to put 'required' values in the Namespace.  That's a similar issue.

An idea that I tried for that (but didn't submit as a patch) is to move the 
tests at the end of _parse_know_args to a separate function that is called by 
parse_known_args.  

In http://bugs.python.org/issue26394#msg261540 I suggested putting the fallback 
in the testing section of _parse_known_args.  If that testing section is in a 
separate method, it would be easier to customize and add such a fallback.

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<http://bugs.python.org/issue26394>
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