Python3中sys.stdin用法

https://blog.csdn.net/CAU_Ayao/article/details/81985103

Python 字符串前面加u,r,b,f的含义

https://www.cnblogs.com/walo/p/10608436.html

with 和 with as

format_map 和 format

https://blog.csdn.net/jpch89/article/details/84099277#2__29

参考

• Python String format_map() (opens new window)