human
Solve the following python programming problem given the following code:
def test_retry(monkeypatch) : 
    mock_sleep_time = [0] 
    def mock_sleep(seconds) : 
        mock_sleep_time [0] += seconds 
monkeypatch.setattr (time, 'sleep', f) 
    hit = [0] 
    tries = 5 
    delay = 1 
    backoff = 2 
    @ retry (tries = tries, delay = delay, backoff = backoff) 
    def f() : 
        hit [0] += 1 
        (1 / 0) 
with pytest.raises (ZeroDivisionError) : 
        f () 
assert (hit [0] == tries) 
    assert (mock_sleep_time [0] == sum (((delay * (backoff ** i)) for i in range ((tries - 1))))) 

    
    

    Fix the buggy line: monkeypatch.setattr (time, 'sleep', f)
assistant
#Here is Python code to fix the buggy line: monkeypatch.

monkeypatch.setattr (time, 'sleep', def mock_sleep()