python扁平化處理嵌套序列的好辦法

大佬寫的“拍扁”算法，值的收藏一下~ 

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)
items = ['Dave', 'Paula', ['Thomas', 'Lewis']]
for x in flatten(items):
print(x)