第三句改成 self.handlers = handlers[:] 就可以了。
原来的第三句传递的实际是个指针，造成列表的数据不断累积
yi huang 写道:
> class EventHandler(object):
>     def __init__(self,handlers = []):
>         self.handlers = handlers
>     def __call__(self,*args,**kw):
>         for h in self.handlers:
>             h(*args,**kw)
>     def __add__(self,func):
>         self.handlers.append(func)
>         return self
> 
> if __name__=='__main__':
>     def temp():
>         print 'hello'
>     e = EventHandler()
>     e += temp
>     e += temp
>     a = EventHandler()
>     a += temp
>     print len(e.handlers)  #  这里输出来竟然是3 ！！
> 
> 也许是对 += 处理得不对， 不知道如果重载 += 运算符， 找半天也只找到 __add__
> 
> -- 
> http://codeplayer.blogbus.com/

"造成列表的数据不断累积,"这个问题，仔细看手册中Python Tutorial部分。


On 4/27/06, tocer <tocer.deng at gmail.com> wrote:

> 第三句改成 self.handlers = handlers[:] 就可以了。
> 原来的第三句传递的实际是个指针，造成列表的数据不断累积
> yi huang 写道:
> > class EventHandler(object):
> >     def __init__(self,handlers = []):
> >         self.handlers = handlers
> >     def __call__(self,*args,**kw):
> >         for h in self.handlers:
> >             h(*args,**kw)
> >     def __add__(self,func):
> >         self.handlers.append(func)
> >         return self
> >
> > if __name__=='__main__':
> >     def temp():
> >         print 'hello'
> >     e = EventHandler()
> >     e += temp
> >     e += temp
> >     a = EventHandler()
> >     a += temp
> >     print len(e.handlers)  #  这里输出来竟然是3 ！！
> >
> > 也许是对 += 处理得不对， 不知道如果重载 += 运算符， 找半天也只找到 __add__
> >
> > --
> > http://codeplayer.blogbus.com/
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