Alexander Boyd <a...@opengroove.org> added the comment:

This is not fixed. The accepted fix doesn't take NotImplemented into account, 
with the result that comparing two mutually-incomparable objects whose ordering 
operations were generated with total_ordering causes a stack overflow instead 
of the expected "TypeError: unorderable types: Foo() op Bar()".

I've attached a fix for this. It properly takes NotImplemented into account. It 
also generates __eq__ from __ne__ and vice versa if only one of them exists.

----------
nosy: +javawizard
Added file: http://bugs.python.org/file21708/sane_total_ordering.py

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<http://bugs.python.org/issue10042>
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