函数中的参数数目可变

非常简单:要求调用方传递两个列表(或元组或其他):

def call(a,alphabets=None,numbers=None):
    if alphabets is None:
        alphabets = []
    if numbers is None:
        numbers = []
    print(a)
    print(alphabets)
    print(numbers)


call("?")
call("?", ["a", "b", "c"])
call("?", ["a", "b", "c"], (1, 2, 3))
call("?"), None, (1, 2, 3))
# etc