if there are not duplicates in a list python code example

Example 1: python remove duplicates from list

bad_list = ["hi", 1, 2, 2, 3, 5, "hi", "hi"]
good_list = list(set(bad_list))

Example 2: python check for duplicate

def checkDuplicate(user):
    if len(set(user)) < len(user):
        return True
    return False