human
Solve the following python programming problem given the following code:
def test_query(self) : 
    db = asyncmongo.Client (pool_id = 'test_query', host = '127.0.0.1', port = int (self.mongod_options [0] [1]), dbname = 'test', mincached = 3) 
    def noop_callback(response, error) : 
        logging.info (response) 
        loop = tornado.ioloop.IOLoop.instance () 
        loop.add_timeout ((time.time () + 0.1), loop.stop) 
before = self.get_open_cursors () 
    db.foo.find ({ 
        
}, callback = noop_callback) 
    tornado.ioloop.IOLoop.instance ().start () 
    db.foo.find ({ 
        
}, callback = noop_callback) 
    tornado.ioloop.IOLoop.instance ().start () 
    after = self.get_open_cursors () 
    assert (db == after), ('%d cursors left open (should be 0)' % (after - before)) 

    
    

    Fix the buggy line: assert (db == after), ('%d cursors left open (should be 0)' % (after - before))
assistant
#Here is Python code to find ({ 
.

assert (before == after), ('%d cursors left open (should be 0)' % (after - before))