import time, functools

def metric(fn):

@functools.wraps(fn)

def wrapper(*args, **kw):

# 获取开始时间

start = time.time()

tmp = fn(*args, **kw)

# 获取结束时间

end = time.time()

print('%s executed in %s ms' % (fn.__name__, int(round((end -start)*1000))))

return tmp

return wrapper