Terry J. Reedy <tjre...@udel.edu> added the comment:

The current paragraph
"There are no implied relationships among the comparison operators. The
truth of x==y does not imply that x!=y is false. Accordingly, when
defining __eq__(), one should also define __ne__() so that the operators
will behave as expected. "
is false.

Please, let us replace it now, for 3.1 release, with the correct
"There is one implied relationship among comparison operators: defining
__eq__ gives an automatic __ne__ (but not the other way).  There is no
similar relationship for the order comparisons."
without waiting for a more extensive rewrite.

----------
versions: +Python 3.1 -Python 3.0

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4395>
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