pymysql cannot connect to mysql

I am trying to use pymsql to connect to MySQL db, the host is '115.28.236.225', and using the default port: 3306. The code is as bellow (db_connect.py):

import pymysqldef connDB():    conn=pymysql.connect(host='115.28.236.225',user='root',passwd='xxx',db='yyy',charset='utf8', port=3306)    cur=conn.cursor();    return (conn,cur);conn,cur=connDB()

I use python db_connect.py to run, however, I got the error message pymysql.err.OperationalError: (1045, u"Access denied for user 'root'@'58.196.159.221' (using password: YES)") , I don't know where the host '58.196.159.221' comes from, which does not correspond to the one in the code.

(I have tried to use MySql Workbench to connect to MySQL, and that worked, so, I am sure it must be something wrong with the python code).

How can I solve this? Thanks in advance!