python 解开嵌套的序列

from collections import Iterable

def flatten(items, ignore_types=(str, bytes)): for x in items: if isinstance(x, Iterable) and not isinstance(x, ignore_types): yield from flatten(x) else: yield x

items = [1, 2, [3, 4, [5, 6], 7], 8]

Produces 1 2 3 4 5 6 7 8

for x in flatten(items): print(x)