Tatiana Al-Chueyr added the comment:

My proposal is that both:
- add_mutually_exclusive_group()
- add_argument_group()

print optional arguments in the same way when title and/or description are 
provided.

I've attached a test case of the proposed behavior.

Please, let me know if you have any objections or suggestions! :)

I'm working on the implementation right now.

Note: it is outside the existing Lib/test/test_argparse.py for clarifying the 
idea.

BTW: thanks to r.david.murray for mentoring and discussing use cases!

----------
nosy: +paul.j3, r.david.murray, tati_alchueyr
Added file: http://bugs.python.org/file34844/test_argparse_mutex_with_title.py

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