"Thomas Girod" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hi there. > > I'm trying to use new-style classes, but there is something i'm > obviously missing > > here it is : > > class Data(list): > __slots__ = ["width", "height", "label"] > > def __init__(self,width,height,label=None): > list.__init__(self) > self.width = width > self.height = height > self.label = label > > def clear(cls): > while len(cls) > 0: del cls[0] > return > clear = classmethod(clear) > > #> d = Data(2,2) > #> d.clear() > TypeError: len() of unsized object > > off course it was working with : > > [...] > def clear(self): > while len(self) > 0: del self[0] > return > > So, I guess you can't use "cls" as a replacement for "self". So, what > do I have to use ??? >
Um, why do you think clear() needs to be a classmethod? Isn't it supposed to work on an instance of Data? If you just remove that "clear = classmethod(clear)" statement, I think this works as you expect. (Although your implementation of clear() will work correctly, you might consider the more efficient "del self[:]" slice operation, instead of your while loop.) -- http://mail.python.org/mailman/listinfo/python-list
