Python list comprehension to return a list of items from list A that are not in list B.
a = ["Peter", "Lois", "Stewey", "Quagmire", "Brian", "Chris", "Meg"]
b = ["Lois", "Brian", "Meg"]
return [x for x in set(a).difference(b)]
"""
returns
["Peter", "Stewey", "Quagmire", "Chris"]
"""