scrapy中 Mongo的存储

import pymongo

MONGO_HOST = 'localhost'
MONGO_PORT = 27017
MONGO_DB = 'today'
MONGO_COLL = 'mm'

class MingyanPipeline(object):
def process_item(self, item, spider):

         # mongo
    mongo_client = pymongo.MongoClient(host=MONGO_HOST, port=MONGO_PORT)
    db = mongo_client[MONGO_DB]
    coll = db[MONGO_COLL]
    coll.insert(dict(item))

    return item