.T
array([
[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14],
[15, 16, 17, 18, 19]])
arr.T #求转置
array([
[ 0, 5, 10, 15],
[ 1, 6, 11, 16],
[ 2, 7, 12, 17],
[ 3, 8, 13, 18],
[ 4, 9, 14, 19]])
https://www.cnblogs.com/sunshinewang/p/6893503.html
https://blog.csdn.net/together_cz/article/details/75648062
https://blog.csdn.net/u011475210/article/details/77926028
https://www.oschina.net/code/snippet_658568_22342
https://blog.csdn.net/u013920434/article/details/52507173
https://pan.baidu.com/s/1LgKUL7f4ja7mz0js-y62qg
http://www.runoob.com/rss/rss-tutorial.html
https://blog.csdn.net/qq_22073849/article/details/53582714?locationNum=8&fps=1
https://blog.csdn.net/jackliu16/article/details/79575476