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bpo-41910: specify the default implementations of object.__eq__ and object.__ne__ (GH-22874)

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See Objects/typeobject.c:object_richcompare() for the implementation of this in CPython.

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Doc/reference/datamodel.rst
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@ -1395,12 +1395,14 @@ Basic customization
context (e.g., in the condition of an ``if`` statement), Python will call context (e.g., in the condition of an ``if`` statement), Python will call
:func:`bool` on the value to determine if the result is true or false. :func:`bool` on the value to determine if the result is true or false.
By default, :meth:`__ne__` delegates to :meth:`__eq__` and By default, ``object`` implements :meth:`__eq__` by using ``is``, returning
inverts the result unless it is ``NotImplemented``. There are no other ``NotImplemented`` in the case of a false comparison:
implied relationships among the comparison operators, for example, ``True if x is y else NotImplemented``. For :meth:`__ne__`, by default it
the truth of ``(x<y or x==y)`` does not imply ``x<=y``. delegates to :meth:`__eq__` and inverts the result unless it is
To automatically generate ordering operations from a single root operation, ``NotImplemented``. There are no other implied relationships among the
see :func:`functools.total_ordering`. comparison operators or default implementations; for example, the truth of
``(x<y or x==y)`` does not imply ``x<=y``. To automatically generate ordering
operations from a single root operation, see :func:`functools.total_ordering`.
See the paragraph on :meth:`__hash__` for See the paragraph on :meth:`__hash__` for
some important notes on creating :term:`hashable` objects which support some important notes on creating :term:`hashable` objects which support

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Misc/NEWS.d/next/Core and Builtins/2020-10-21-14-40-54.bpo-41910.CzBMit.rst Normal file
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@ -0,0 +1 @@
Document the default implementation of `object.__eq__`.