New submission from Alex Samuel <[EMAIL PROTECTED]>:

Methods of set and frozenset that return new set or frozenset instances
return instances of subclasses, but these instances are not initialized
correctly.  In the attached code sample, z is an instance of MySet but
MySet.__new__ and MySet.__init__ are never called on it.  

It seems to me that such a method should return a fully-initialized
instance of the subclass.  Barring that, it should just return a set or
frozenset instance, not an instance of the subclass.

----------
assignee: theller
components: ctypes
files: fs.py
messages: 76062
nosy: alexhsamuel, theller
severity: normal
status: open
title: frozen?set operations create incorrectly initialized instances of 
subclasses
type: behavior
versions: Python 2.5, Python 3.0
Added file: http://bugs.python.org/file12062/fs.py

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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue4357>
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