A new feature request - parser add_mutually_exclusive_group - add a default value

Hi,

Please look at this Stack Overflow post:
https://stackoverflow.com/questions/78722378/parser-add-mutually-exclusive-group-how-can-i-set-a-default-value

1. Is there a way to add a default to parser add_mutually_exclusive_group
groups - a value that will be set by default? In this case I
want test-default-languages=True to be set as a default.

2. I tried to subscribe to Python-ideas python-ideas@python.org, but I
can't login to
https://mail.python.org/mailman3/lists/python-ideas.python.org/. Although I
did login to https://mail.python.org/mailman/options/python-list . Do I
have to create a new account?

Thanks,
Uri.
אורי
uri@speedy.net