python 连接sql server 2003

import pymssql
class mssql():
    def __init__(self):
        self.host=''
        self.user=''
        self.pwd=''
        self.db=''
        self.conn = pymssql.connect(host=self.host, user=self.user, password=self.pwd, database=self.db, charset='utf8')
        self.cur=self.conn.cursor()