python chain模块

chain函数串联a和b，兼顾内存效率同时写法更加优雅。

from itertools import chain
a = [1,3,5,0]
b = {'a':1,'b':2}

for i in chain(a,b):
  print(i)

#result:1,3,5,0,a,b

for i in chain(a,b.values()):
  print(i)

#result:1,3,5,0,1,2

c = '2,4,6'

for i in chain(a,c):
  print(i)

#result:1,3,5,0,2,4,6