[ python-Bugs-1179957 ] Missing def'n of equality for set elements

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Bugs item #1179957, was opened at 2005-04-09 17:10
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Category: Documentation
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Skip Montanaro (montanaro)
Assigned to: Nobody/Anonymous (nobody)
Summary: Missing def'n of equality for set elements

Initial Comment:
The documentation of the sets module doesn't describe the
properties of set elements that they must have to properly
work in sets (at least I didn't see it described).  In creating a
set of instances, I had to sort of stumble around and
discover that the class needed to define both __eq__ and
__hash__.  Either alone didn't seem to work.  Perhaps I've
got it all wrong and there's a better way to do things.  It would
be nice if the docs described things officially though.




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