argparse mutex group should allow mandatory parameters

[MarkNolan]

BPO	29937

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assignee = None
closed_at = None
created_at = <Date 2017-03-28.17:43:18.709>
labels = ['type-feature', 'library']
title = 'argparse mutex group should allow mandatory parameters'
updated_at = <Date 2017-03-28.17:43:18.709>
user = 'https://bugs.python.org/MarkNolan'

bugs.python.org fields:

activity = <Date 2017-03-28.17:43:18.709>
actor = 'Mark Nolan'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-03-28.17:43:18.709>
creator = 'Mark Nolan'
dependencies = []
files = []
hgrepos = []
issue_num = 29937
keywords = []
message_count = 1.0
messages = ['290750']
nosy_count = 1.0
nosy_names = ['Mark Nolan']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29937'
versions = ['Python 3.3', 'Python 3.4', 'Python 3.5', 'Python 3.6']

[MarkNolan]

I see elsewhere, and from use, that a mutex group will not support mandatory positional parameters.

TBH, I don't understand why this should be any different from any other option, but if it must, then I think it should follow the 'required' parameter of the mutex.

So, it should be possible to have a mutex group where one option must be chosen and that option must have positional parameters.

(My first post here. Not sure of any other way to discuss with the argparse development group. Point me somewhere else if appropriate).