human
Solve the following python programming problem given the following code:
@ gen_test (timeout = 30) 
def test_max_time_ms_each_getmore(self) : 
    (yield self.collection.insert (({ 
        
} for _ in range (200)))) 
    try : 
        cursor = self.collection.find ().max_time_ms (100000) 
        (yield cursor.fetch_next) 
        cursor.next_object () 
        future = Future () 
        def callback(result, error) : 
            if error : 
                future.set_exception (error) 
else : 
                if (not result) : 
                    future.set_result (None) 
(yield self.enable_timeout ()) 
        with self.assertRaises (ExecutionTimeout) : 
            cursor.each (_) 
            (yield future) 
(yield cursor.close ()) 
finally : 
        (yield self.disable_timeout ()) 
        (yield self.collection.remove ()) 

    
    

    Fix the buggy line: cursor.each (_)
assistant
#Here is Python code to find ().

cursor.each (def callback()