python学习笔记7.6-内建模块itertools

from itertools import count

a = count(2) #迭代的起始参数
for i in a:
    print(i)

from itertools import cycle

a = cycle('abcde') #迭代的起始参数
for i in a:
    print(i)

from itertools import repeat

a = repeat('abcde',6) #迭代的起始参数
for i in a:
    print(i)

from itertools import chain

a = chain('abcde','fghhhh')
print(a) #直接打印，只能显示迭代地址

for i in a:
    print(i)

from itertools import groupby

a = groupby('abcdefghhhhdfadsdfsdeewef')
for key,value in a:
    print(key,list(value))