GH avatar Bite 123. Find the user with most friends

In this Bite you are presented with a users dict of keys=id's and values=usernames and a friendships list of user ID tuples expressing a friendship between two users.

Loop through friendships and find out which user has the most friends. Return a tuple of friend name and his or her friends. Have fun!

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Pythonistas rate this Bite 6.0 on a 1-10 difficulty scale.
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We use Python 3.7