[issue17218] support title and description in argparse add_mutually_exclusive_group

[paul j3]

paul j3 added the comment:

The attached file implements a solution using a subclassed ArgumentParser and a .add_titled_mutually_exclusive_group method (two versions).

I changed the test conditions a bit, removing a blank line, and making the usage 'exclusive'.

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Added file: http://bugs.python.org/file34926/test_argparse_mutex_with_title1.py

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