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Clarify the lack of relationship between rich comparison operators.

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Prompted by a discussion on comp.lang.python.
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Raymond Hettinger 2003-07-16 19:40:23 +00:00
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Doc/ref/ref3.tex
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@ -1089,6 +1089,11 @@ used in a Boolean context, the return value should be interpretable as
a Boolean value, else a \exception{TypeError} will be raised.
By convention, \code{False} is used for false and \code{True} for true.
There are no implied relationships among the comparison operators.
The truth of {\var{x}==\var{y}} does not imply that \code{\var{x}!=\var{y}}
is false. Accordingly, when defining \method{__eq__}, one should also
define \method{__ne__} so that the operators will behave as expected.
There are no reflected (swapped-argument) versions of these methods
(to be used when the left argument does not support the operation but
the right argument does); rather, \method{__lt__()} and