import pymongo
def get_mongodb_conn(**kwargs):
    db_host = kwargs.get(‘host‘)
    db_port = kwargs.get(‘port‘)
    db_name = kwargs.get(‘db_name‘,settings[‘MONGODB_DBNAME‘])
    mongo_client = pymongo.MongoClient(host = db_host,port = db_port)#连接mongodb
    mongo_db = mongo_client[db_name]#连接一个库
    return mongo_db