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
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#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:
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#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:
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#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
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#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
希望本文所述对大家Python程序设计有所帮助。
原文链接：https://blog.csdn.net/YANG_Gang2017/article/details/78568411
