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[3.7] bpo-17422: Language reference should specify restrictions on class namespace (GH-18559) #18611

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Feb 22, 2020
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[3.7] bpo-17422: Language reference should specify restrictions on class namespace (GH-18559) #18611

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6 changes: 4 additions & 2 deletions Doc/reference/datamodel.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1932,10 +1932,12 @@ Once the appropriate metaclass has been identified, then the class namespace
is prepared. If the metaclass has a ``__prepare__`` attribute, it is called
as ``namespace = metaclass.__prepare__(name, bases, **kwds)`` (where the
additional keyword arguments, if any, come from the class definition). The
``__prepare__`` method should be implemented as a :func:`classmethod`.
``__prepare__`` method should be implemented as a :func:`classmethod`. The
namespace returned by ``__prepare__`` is passed in to ``__new__``, but when
the final class object is created the namespace is copied into a new ``dict``.

If the metaclass has no ``__prepare__`` attribute, then the class namespace
is initialised as an empty ordered mapping.
is initialised as an empty :func:`dict`.

.. seealso::

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Documentation/2020-02-19-11-13-47.bpo-17422.g7_9zz.rst
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@@ -0,0 +1 @@
The language reference now specifies restrictions on class namespaces. Adapted from a patch by Ethan Furman.