Python操作MongoDB数据库

import sysfrom pymongo import MongoClientreload(sys)sys.setdefaultencoding('utf-8')class MongoBase:    def __init__(self,collection):        self.collection=collection        self.OpenDB()    def OpenDB(self):        user='******'        passwd='******'        host='******'        port='******'        auth_db='******'        uri = "mongodb://"+user+":"+passwd+"@"+host+":"+port+"/"+auth_db+"?authMechanism=SCRAM-SHA-1"        self.con = MongoClient(uri, connect=False)        self.db=self.con['qq']        self.collection=self.db[self.collection]    def closeDB(self):        self.con.close()