一,无穷循环器:count,cycle,repeat
(1)count(5,3) #从5开始的整数循环器,每次增加3,即:5,8,11,14,17...from itertools import *import time a = count(5,3)for i in a: print(i) time.sleep(1)
(2)cycle('zxy') #重复元素x y z x y z x y z... from itertools import *import time s = cycle('xyz')for i in s: print(i) time.sleep(1)
repeat() #重复元素例1:from itertools import *import time s = repeat(3.14) #无限重复元素for i in s: print(i) time.sleep(1)
二,函数式工具:starmap,takewhile,dropwhile
(1)starmap() #跟map类似from itertools import *s = starmap(pow,[(1,1),(2,2),(3,3)]) #pow()求指数1**1,2**2,3**3for i in s: print(i)