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bpo-17422: Language reference should specify restrictions on class namespace (#18559)

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The language reference now specifies restrictions on class namespaces.  Adapted from a patch by Ethan Furman.
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ananthan-123 2020-02-22 23:26:02 +05:30 • committed by GitHub
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Doc/reference/datamodel.rst
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@ -1946,10 +1946,12 @@ 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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Misc/NEWS.d/next/Documentation/2020-02-19-11-13-47.bpo-17422.g7_9zz.rst Normal file
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@ -0,0 +1 @@
The language reference now specifies restrictions on class namespaces. Adapted from a patch by Ethan Furman.