python学习--如何在一个for循环中迭代多个可迭代对象?串行,并行

并行,使用zip函数。

l1=['1','2','3','4','5']

l2=['a','b','c','d','e']

l3=['qqq','www','eee','rrr','ttt']

l4=zip(l1,l2,l3)

for x,y,z in l4:

  print(x,y,z)

print(list(zip(l1,l2,l3))) #[('1', 'a', 'qqq'), ('2', 'b', 'www'), ('3', 'c', 'eee'), ('4', 'd', 'rrr'), ('5', 'e', 'ttt')]

串行:使用itertools下的chain函数

from itertools import chain

l1=['1','2','3','4','5']

l2=['a','b','c','d','e']

l3=['qqq','www','eee','rrr','ttt']

l4=chain(l1,l2,l3)

for x in l4:

  print(x)

print(list(chain(l1,l2,l3))) #['1', '2', '3', '4', '5', 'a', 'b', 'c', 'd', 'e', 'qqq', 'www', 'eee', 'rrr', 'ttt']