列表理解 - 使用每个元素两次

Question

我有两个列表如下:

first = [1, 2, 3] # integers
second = ["A", "B"]

我想生成以下列表,交替A和B.请注意,生成的iterable比输入的iterables长:

["1A", "1B", "2A", "2B", "3A", "3B"]

我目前正在使用itertools:

[str(x1) + x2 for x1, x2 in itertools.product(first, second)]

但这是"最好的"方式吗？有没有需要导入的解决方案？

Answer 1

你可以试试

>>> first = [1, 2, 3]
>>> second = ['A', 'B']
>>> ["{}{}".format(f, s) for s in second for f in first]
['1A', '2A', '3A', '1B', '2B', '3B']