TypeError: __init__() takes 1 positional argument but 2 positional arguments (and 2 keyword-only arg

转载自：http://www.ncyteng.com/news/show/975.html

pymysql连接数据库报错，TypeError: __init__() takes 1 positional argument but 2 positional arguments (and 2 keyword-only arguments) were given

 代码如下：

conn = pymysql.connect('localhost', user='root', password='123456')

经过查阅，发现是因为pymysql的版本有变化，传参规则变得规范了，传参的参数名要写全

改为：

conn = pymysql.connect(host='localhost', user='root', password='123456')