差点忘记修正name了

def metric(fn):
	@functools.wraps(fn) # 注意修正函数名
	def time_tick(*arg,**kw):
		t = time.time()
		answer = fn(*arg,**kw)
		t = time.time() - t
		print('%s executed in %s ms' % (fn.__name__, t))
		return answer
	return time_tick