Comments on: Odd Old-Style vs. New-Style Class Behavior http://blog.dowski.com/2009/05/21/odd-old-style-vs-new-style-class-behavior/ Unfortunately, Christian had a Thwart, and the Magpie stayed in play. Mon, 06 Sep 2010 11:51:07 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Matt Wilson http://blog.dowski.com/2009/05/21/odd-old-style-vs-new-style-class-behavior/comment-page-1/#comment-112128 Matt Wilson Fri, 22 May 2009 13:18:34 +0000 http://blog.dowski.com/?p=279#comment-112128 There's a *lot* of old-style classes floating around, even in the standard library. I don't understand the issue you're seeing here, but a while back I ran into a bunch of problems when I tried to use UserDict. Since UserDict is an old-style class, my calls to super yielded some hilariously confusing error messages. There’s a *lot* of old-style classes floating around, even in the standard library. I don’t understand the issue you’re seeing here, but a while back I ran into a bunch of problems when I tried to use UserDict. Since UserDict is an old-style class, my calls to super yielded some hilariously confusing error messages.

]]> By: christian http://blog.dowski.com/2009/05/21/odd-old-style-vs-new-style-class-behavior/comment-page-1/#comment-112127 christian Thu, 21 May 2009 21:29:04 +0000 http://blog.dowski.com/?p=279#comment-112127 A great follow-up here: http://mg.pov.lt/blog/suprising-old-style-classes A great follow-up here: http://mg.pov.lt/blog/suprising-old-style-classes

]]> By: christian http://blog.dowski.com/2009/05/21/odd-old-style-vs-new-style-class-behavior/comment-page-1/#comment-112126 christian Thu, 21 May 2009 21:10:15 +0000 http://blog.dowski.com/?p=279#comment-112126 It's true, I do see differences, but I still can't explain them. :-) The <code>__getattr__</code> method seems to be called on the old-style class for <code>__contains__</code> and returns the <code>self._items</code> dictionary's instance of it. Meanwhile on the new-style class, <code>__getattr__</code> is never called. It’s true, I do see differences, but I still can’t explain them. :-) The __getattr__ method seems to be called on the old-style class for __contains__ and returns the self._items dictionary’s instance of it. Meanwhile on the new-style class, __getattr__ is never called.

]]> By: Robert Brewer http://blog.dowski.com/2009/05/21/odd-old-style-vs-new-style-class-behavior/comment-page-1/#comment-112125 Robert Brewer Thu, 21 May 2009 20:19:49 +0000 http://blog.dowski.com/?p=279#comment-112125 Change your getattr funcs to this: def __getattr__(self, attr): result = getattr(self._items, attr) print 'Retrieving attr %r = %r' % (attr, result) return result ...and you'll start to see the differences. ;) Change your getattr funcs to this:

def __getattr__(self, attr):
result = getattr(self._items, attr)
print ‘Retrieving attr %r = %r’ % (attr, result)
return result

…and you’ll start to see the differences. ;)

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