[ python-Bugs-1459733 ] sets.Set can't be subclassed

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Bugs item #1459733, was opened at 2006-03-28 02:37
Message generated for change (Comment added) made by gbrandl
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Category: Python Library
Group: Python 2.3
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Michal Kwiatkowski (rubyjoker)
Assigned to: Nobody/Anonymous (nobody)
Summary: sets.Set can't be subclassed

Initial Comment:
sets.Set class fail to hide its implementation. 
Subclassing it and overriding __init__ causes an 
exception during object creation.

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>Comment By: Georg Brandl (gbrandl)
Date: 2006-03-28 07:48

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Ziga is correct, this is Invalid.

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Comment By: Žiga Seilnacht (zseil)
Date: 2006-03-28 06:33

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This is a bug in your code, you have to call
the base class's __init__ method. The error
does not occur during the object creation,
but later when repr(obj) fails due to incorrect
initialization.

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Comment By: Michal Kwiatkowski (rubyjoker)
Date: 2006-03-28 02:41

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I'm posting a proposed patch with a test case covering this 
bug (shouldn't all standard library modules have tests?). It 
may introduce performance lost, as it removes __slots__ 
definition.

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