修改pymysql连接语句，兼容python3.8 #3
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使用python3.8进行MySQL数据库连接的时候，发现出现以下错误”init() takes 1 positional argument but 5 were given“
可能是python3.8的函数在使用时需要指定参数名，否则会使用默认的参数模板，现使用兼容写法