python 装饰器 传递参数简单案例

def debug(func):

     def wrapper(*args, **kwargs): # 指定宇宙无敌参数

    print "[DEBUG]: enter {}()".format(func.__name__)

    print 'Prepare and say...',

         return func(*args, **kwargs)

 return wrapper # 返回

@debug

def say(something):

  print "hello {}!".format(something)

Python提供了可变参数*args和关键字参数**kwargs,有了这两个参数,装饰器就可以用于任意目标函数了。

 

参考:https://www.cnblogs.com/cicaday/p/python-decorator.html

我自己的例子

#!/usr/bin/env python
#todo use decorator to decorate the function that need debug and its function name
def debug(f):
  def wrapper(*args,**kwargs):
    print("this is the name of function: {0}".format(f.__name__))
    if kwargs['username'] != 'admin':
      raise Exception('you need to be admin') 
    f(*args,**kwargs) #装饰器内部函数的参数等于被修饰函数的参数
  return wrapper


@debug
def say_hi(sth,username):

  print("this is position args {0}".format(sth))
  print("i am the master: {0}".format(username))
if __name__ == '__main__':
  say_hi('first args',username='admin')
  say_hi('first args',username='haha')

 

*args  -- 相当于 列表   **kwargs -- 相当于字典

posted @ 2018-05-17 10:36  littlevigra  阅读(619)  评论(2编辑  收藏  举报