Python: Tornado and persistent database connection
The simplest thing is just to make the database connection object a module-level global variable. See this example from the Motor documentation:
db = motor.motor_tornado.MotorClient().test_databaseapplication = tornado.web.Application([ (r'/', MainHandler)], db=db)application.listen(8888)tornado.ioloop.IOLoop.instance().start()RequestHandlers could simply use the global variable directly. Also, passing the database as the db keyword argument to Application makes it available to request handlers in their "settings" dict:
class MainHandler(tornado.web.RequestHandler): def get(self): db = self.settings['db']This might make it easier to access the database object from RequestHandlers defined in other files.