pymysql拒绝用户访问

Question

当我访问数据库虽然我已经在mysql数据库中更新了用户但仍然无法运行脚本来访问mysql。

    import pymysql.cursors

connection=pymysql.connect(host='localhost',user='szp',password='letmein',db='cactidb',charset='utf8mb4',cursorclass=pymysql.cursors.DictCursor)
print("connection succeeds!")

try:
    with connection.cursor() as cursor:
        sql="SELECT ...;"
        cursor.execute(sql)
        print("cursor.description:",cursor.description)
        print() 
        for row in cursor:
            print(row)
finally:
    connection.close()

运行脚本时出现此错误！

pymysql.err.InternalError: (1698, u"Access denied for user 'szp'@'localhost'")

任何人都可以帮忙解决这个问题吗？