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bpo-38524: clarify example a bit and improve formatting #17406

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Nov 28, 2019
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bpo-38524: clarify example a bit and improve formatting #17406

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13 changes: 8 additions & 5 deletions Doc/reference/datamodel.rst
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Expand Up @@ -1657,13 +1657,16 @@ class' :attr:`~object.__dict__`.

.. note::

``__set_name__`` is only called implicitly as part of the ``type`` constructor, so
it will need to be called explicitly with the appropriate parameters when a
descriptor is added to a class after initial creation::
:meth:`__set_name__` is only called implicitly as part of the
:class:`type` constructor, so it will need to be called explicitly with
the appropriate parameters when a descriptor is added to a class after
initial creation::

class A:
pass
descr = custom_descriptor()
cls.attr = descr
descr.__set_name__(cls, 'attr')
A.attr = descr
descr.__set_name__(A, 'attr')

See :ref:`class-object-creation` for more details.

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