python装饰器

import time

def foo():
      time.sleep(3)
      print(‘from to foo‘)

def timer(func):
      start_time=time.time()
      func()
      stop_time=time.time()
      print(‘函数运行时间是 %s‘  %(stop_time- start_time))
      return func
foo=timer(foo)
foo()

def  foo(name):
        print(‘传入参数 %s‘ %name)
        def    nam():
                print(‘传入参数 %s‘ %name)
                def    na()
                        name = ‘alxe‘
                        print(‘传入参数 %s‘ %name)
                na()
        nam()
foo(‘小明‘)