8000 bpo-41706: Fix dunder operator invocation docs by wchargin · Pull Request #22084 · python/cpython · GitHub
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Aug 4, 2021
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bpo-41706: Fix dunder operator invocation docs #22084

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7 changes: 4 additions & 3 deletions Doc/reference/datamodel.rst
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Expand Up @@ -2330,7 +2330,7 @@ left undefined.
(``+``, ``-``, ``*``, ``@``, ``/``, ``//``, ``%``, :func:`divmod`,
:func:`pow`, ``**``, ``<<``, ``>>``, ``&``, ``^``, ``|``). For instance, to
evaluate the expression ``x + y``, where *x* is an instance of a class that
has an :meth:`__add__` method, ``x.__add__(y)`` is called. The
has an :meth:`__add__` method, ``type(x).__add__(x, y)`` is called. The
:meth:`__divmod__` method should be the equivalent to using
:meth:`__floordiv__` and :meth:`__mod__`; it should not be related to
:meth:`__truediv__`. Note that :meth:`__pow__` should be defined to accept
Expand Down Expand Up @@ -2366,8 +2366,9 @@ left undefined.
(swapped) operands. These functions are only called if the left operand does
not support the corresponding operation [#]_ and the operands are of different
types. [#]_ For instance, to evaluate the expression ``x - y``, where *y* is
an instance of a class that has an :meth:`__rsub__` method, ``y.__rsub__(x)``
is called if ``x.__sub__(y)`` returns *NotImplemented*.
an instance of a class that has an :meth:`__rsub__` method,
``type(y).__rsub__(y, x)`` is called if ``type(x).__sub__(x, y)`` returns
*NotImplemented*.

.. index:: builtin: pow

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Documentation/2020-09-03-13-37-19.bpo-41706._zXWOR.rst
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@@ -0,0 +1,2 @@
Fix docs about how methods like ``__add__`` are invoked when evaluating
operator expressions.
0