python常用内建模块

datetime

collections

https://www.cnblogs.com/mangmangbiluo/p/9882097.html

base64

struct

hashlib

hmac

itertools

contextlib

urllib

XML

HTMLParser

参考：https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/0014319347182373b696e637cc04430b8ee2d548ca1b36d000