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AsyncMongo is an asynchronous library for accessing mongo which is built on the tornado ioloop.


Installing: pip install asyncmongo

Installing form github: pip install git+

Installing from source: git clone git://; cd asyncmongo; python install


asyncmongo syntax strives to be similar to pymongo.

import asyncmongo
import tornado.web

class Handler(tornado.web.RequestHandler):
    def db(self):
        if not hasattr(self, '_db'):
            self._db = asyncmongo.Client(pool_id='mydb', host='', port=27017, maxcached=10, maxconnections=50, dbname='test')
        return self._db

    def get(self):
        self.db.users.find({'username': self.current_user}, limit=1, callback=self._on_response)
        # or
        # conn = self.db.connection(collectionname="...", dbname="...")
        # conn.find(..., callback=self._on_response)

    def _on_response(self, response, error):
        if error:
            raise tornado.web.HTTPError(500)
        self.render('template', full_name=respose['full_name'])


Some features are not currently implemented:

  • directly interfacing with indexes, dropping collections
  • retrieving results in batches instead of all at once (asyncmongo's nature means that no calls are blocking regardless of the number of results you are retrieving)
  • native Replica Set support #16
  • tailable cursors #15


The following two python libraries are required


Please report any issues via github issues