Jon Obermark added the comment:
The closing author is correct, the use case is adequately covered by __init__,
and that has been fixed in 3. It makes sense this will not be backported.
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Python tracker
<http://bugs.python.org/issue15
New submission from Jon Obermark:
If they are not going to call the __metaclass__ or the class __new__, then they
should return `set` objects instead of subclass objects, so that it is clear
what is going on.
As it is, the results of set operations receive some subclass information but
not
