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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
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希望本文所述对大家Python程序设计有所帮助。
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