import time, functools
def metric(fn):
    @functools.wraps(fn)
    def wrapper(*args, **kw):
        start = time.time()
        result = fn(*args, **kw)
        end = time.time()
        print('%s executed in %f ms' % (fn.__name__, end - start))
        return result
    return wrapper 
 
# 测试
@metric
def fast(x, y):
    time.sleep(0.0012)
    return x + y;
 
@metric
def slow(x, y, z):
    time.sleep(0.1234)
    return x * y * z;
 
f = fast(11, 22)
s = slow(11, 22, 33)
if f != 33:
    print('测试失败!')
elif s != 7986:
    print('测试失败!')
# your code goes here
# your code goes here

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