human
Solve the following python programming problem given the following code:
@ async 
def async_method(self) : 
    def check_the_same_thread() : 
        return (thread.get_ident () == self._main_thread) 
if (not self.testing_gevent) : 
        is_same_thread = (yield self.Task (<MASK>)) 
        self.assertFalse (is_same_thread) 
self.assert_ (check_the_same_thread ()) 
    def simple_func() : 
        return 42 
r1 = (yield self.Task (simple_func)) 
    r2 = (yield self.Task (self.simple_method)) 
    self.assertEqual (r1, r2) 
    with self.assertRaises (ZeroDivisionError) : 
        (yield self.Task (self.throwing, 'test')) 
t = time.time () 
    sleep_time = 0.1 
    def for_multi(need_raise = False) : 
        self.sleep (sleep_time) 
        if need_raise : 
            raise ZeroDivisionError () 
return 42 
tasks = [self.Task (for_multi) for i in range (10)] 
    tasks.append (self.Task (for_multi, True)) 
    with self.assertRaises (ZeroDivisionError) : 
        (yield self.MultiTask (tasks)) 
results = (yield self.MultiTask (tasks, skip_errors = True)) 
    self.assertEquals (len (results), (len (tasks) - 1)) 
    self.assert_ (((time.time () - t) < (len (tasks) * sleep_time))) 
    results = (yield self.MultiTask ([self.Task (for_multi) for _ in range (10)], max_workers = 2)) 
    self.assertEquals (results, ([42] * 10)) 
    (yield self.Task (self.sleep, 0.5)) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: r2, i, _, t, tasks, sleep_time, check_the_same_thread, self, is_same_thread, for_multi, simple_func, results, r1
assistant
#Here is a proper replacement for <MASK>.
check_the_same_thread