本文实例讲述了Python装饰器用法。分享给大家供大家参考，具体如下：

无参数的装饰器

#coding=utf-8def log(func): def wrapper(): print 'before calling ',func.__name__ func() print 'end calling ',func.__name__ return wrapper@logdef hello(): print 'hello'@logdef hello2(name): print 'hello',nameif __name__=='__main__': hello()

运行结果：

before calling hello
hello
end calling hello

带参数的装饰器:

#coding=utf-8def log(func): def wrapper(name): print 'before calling ',func.__name__ func(name) print 'end calling ',func.__name__ return wrapper@logdef hello(name): print 'hello',name@logdef hello2(name): print 'hello',nameif __name__=='__main__': hello('haha')

运行结果：

before calling hello
hello haha
end calling hello

多个参数的时候:

#coding=utf-8def log(func): ''' *无名字的参数 **有名字的参数 :param func: :return: ''' def wrapper(*args,**kvargs): print 'before calling ',func.__name__ print 'args',args,'kvargs',kvargs func(*args,**kvargs) print 'end calling ',func.__name__ return wrapper@logdef hello(name,age): print 'hello',name,age@logdef hello2(name): print 'hello',nameif __name__=='__main__': hello('haha',2) hello(name='hehe',age=3)

输出:

end calling hello
before calling hello
args () kvargs {'age': 3, 'name': 'hehe'}
hello hehe 3
end calling hello

装饰器里带参数的情况

本质就是嵌套函数

#coding=utf-8def log(level,*args,**kvargs): def inner(func): def wrapper(*args,**kvargs): print level,'before calling ',func.__name__ print level,'args',args,'kvargs',kvargs func(*args,**kvargs) print level,'end calling ',func.__name__ return wrapper return inner@log(level='INFO')def hello(name,age): print 'hello',name,age@logdef hello2(name): print 'hello',nameif __name__=='__main__': hello('haha',2)

运行输出：

INFO before calling hello
INFO args ('haha', 2) kvargs {}
hello haha 2
INFO end calling hello

更多关于Python相关内容可查看本站专题：《Python数据结构与算法教程》、《Python Socket编程技巧总结》、《Python函数使用技巧总结》、《Python字符串操作技巧汇总》及《Python入门与进阶经典教程》

希望本文所述对大家Python程序设计有所帮助。