1,map
https://www.cnblogs.com/fnlingnzb-learner/p/5833051.html
2, Itertools
http://www.wklken.me/posts/2013/08/20/python-extra-itertools.html
1,map
https://www.cnblogs.com/fnlingnzb-learner/p/5833051.html
2, Itertools
http://www.wklken.me/posts/2013/08/20/python-extra-itertools.html