Python装饰器用法实例分析
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2023-10-22 08:42:02
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-8
def log(func):
def...
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-8 def log(func): def wrapper(): print 'before calling ',func.__name__ func() print 'end calling ',func.__name__ return wrapper @log def hello(): print 'hello' @log def hello2(name): print 'hello',name if __name__=='__main__': hello()
运行结果:
before calling hello
hello
end calling hello
带参数的装饰器:
#coding=utf-8 def log(func): def wrapper(name): print 'before calling ',func.__name__ func(name) print 'end calling ',func.__name__ return wrapper @log def hello(name): print 'hello',name @log def hello2(name): print 'hello',name if __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-8 def 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 @log def hello(name,age): print 'hello',name,age @log def hello2(name): print 'hello',name if __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-8 def 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 @log def hello2(name): print 'hello',name if __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。
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