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#3803: fix docs for comparison of unequal types.

This commit is contained in:
Georg Brandl 2008-09-09 19:31:57 +00:00
parent 7cd67cc992
commit 9609cea044
1 changed files with 7 additions and 10 deletions
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Doc/reference/expressions.rst
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@ -1003,16 +1003,13 @@ pretty).
The operators ``<``, ``>``, ``==``, ``>=``, ``<=``, and ``!=`` compare the
values of two objects. The objects need not have the same type. If both are
numbers, they are converted to a common type. Otherwise, objects of different
types *always* compare unequal, and are ordered consistently but arbitrarily.
You can control comparison behavior of objects of non-builtin types by defining
a :meth:`__cmp__` method or rich comparison methods like :meth:`__gt__`,
described in section :ref:`specialnames`.
(This unusual definition of comparison was used to simplify the definition of
operations like sorting and the :keyword:`in` and :keyword:`not in` operators.
In the future, the comparison rules for objects of different types are likely to
change.)
numbers, they are converted to a common type. Otherwise, the ``==`` and ``!=``
operators *always* consider objects of different types to be unequal, while the
``<``, ``>``, ``>=`` and ``<=`` operators raise a :exc:`TypeError` when
comparing objects of different types that do not implement these operators for
the given pair of types. You can control comparison behavior of objects of
non-builtin types by defining rich comparison methods like :meth:`__gt__`,
described in section :ref:`customization`.
Comparison of objects of the same type depends on the type: