ModuleNotFoundError: No module named ‘MySQLdb‘

ModuleNotFoundError: No module named ‘MySQLdb’
MySQLdb在python3不能直接安装，可以安装pymysql，然后import pymysql as MySQLdb
需要改下：

#旧
db = MySQLdb.connect("xx.xx.xx.xx", "xx", "xxxx", database_name, port=xxx, charset="xxx")
#新
db = MySQLdb.connect(
	host = "xx.xx.xx.xx", 
	user = "xxx", 
	password = "xxx", 
	database = database_name, 
	port = xxx, 
	charset = "xxx")