import time, functools

def metric(fn):
	@functools.wraps(fn)
	def wrapper(*args, **kw):
		begin = time.time()
		res = fn(*args, **kw)
		end = time.time()
		print('%s executed in %s ms' % (fn.__name__, end - begin))
		return res
	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!')