设计一个decorator装饰器，它可作用于任何函数上，并打印该函数的执行时间：
import time
def deco(func):
def wrapper(*args, **kw):
start_time = time.time()
func(*args, **kw)
end_time = time.time()
print('the function %s runed time is %s' % (func.__name__, (end_time - start_time)))
return wrapper
@deco
def test():
time.sleep(2)
print('this is test func')
test()
