pymysql连接数据库报错TypeError: __init__() takes 1 positional argument but 5 positional arguments

pymysql在1.0以后的版本  无法使用  db = pymysql.connect("localhost","root","root","testdb" ) 

需要修改为 db = pymysql.connect(host="localhost", user="root", password="root", database="testdb")