安装Django3后不想折腾mysqlclient那堆库文件，直接装了pymysql替代mysqlclient,报错：django.core.exceptions.ImproperlyConfigured mysqlclient 1.3.13 or newer is required; you have 0.9.3.。实际上pymysql版本号是 0.9.3，却明目张胆篡改version_info欺骗Django??。这样一来就简单了，patch一下这个属性就行了嘛， 修改__init__.py，多插入一行代码:

import pymysql
pymysql.version_info = (1, 3, 13, "final", 0)
pymysql.install_as_MySQLdb()

参考博客：https://yuntianti.com/posts/fix-django3-mysqlclient-import-error/

Django踩坑之django.core.exceptions.ImproperlyConfigured mysqlclient 1.3.13 or newer is required; you have 0.9.3.