Python中的泛型列表是否有类似"join"的函数？

Question

在Python中,字符串列表可以通过连接在一起

','.join(['ab', 'c', 'def'])

但是我怎么能轻易加入一个数字列表或其他一些东西呢？像这样:

0.join([1, 2, 3])  --->  [1, 0, 2, 0, 3]

现在我必须这样做:

sum([[x, 0] for x in [1, 2, 3]], [])[:-1]

Answer 1

你可以做一个:

def join_generator(joiner, iterable):
    i = iter(iterable)
    yield next(i)  # First value, or StopIteration

    while True:
       # Once next() raises StopIteration, that will stop this
       # generator too.
       next_value = next(i)
       yield joiner
       yield next_value

joined = list(join_generator(0, [1, 2, 3, 4]))