2. Python’s set objects have a method called pop that removes and
returns an arbitrary element from the set. If a set gerbils contains
five cuddly little animals, for example, calling gerbils.pop()
five times will return those animals one by one, leaving the set
empty at the end. Use this to write a function called mating_pairs
that takes two equal-sized sets called males and females as input
and returns a set of pairs; each pair must be a tuple containing
one male and one female. (The elements of males and females may
be strings containing gerbil names or gerbil ID numbers—your
function must work with both.)