def elapsed_time(func):
    import time
 
    def wrapped(*args, **kwargs):
        start_time = time.perf_counter()
        returns = func(*args, **kwargs)
        end_time = time.perf_counter()
        print('{} -> elased time: {:.3f}'.format(func.__name__, end_time - start_time))
        return returns
 
    return wrapped
 
 
@elapsed_time
def test_sleep(t):
    import time
    time.sleep(t)
    return True

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