New submission from ylb:

from pymongo import MongoClient
client = MongoClient('127.0.0.1:27017')['ylb']['ylb']

class del_it(object):
    def __init__(self):
        print 'creat a object', id(self)
        client.update({'id':6253282}, {'$set':{'flag':True}})

    def __del__(self):
        client.update({'id': 6253282}, {'$set': {'flag': False}})
        print '析构了对象', id(self)

if __name__ == "__main__":
    a = del_it()

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