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bpo-15243: Specify __prepare__ should be a classmethod #17124

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Jan 25, 2020
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bpo-15243: Specify __prepare__ should be a classmethod #17124

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3 changes: 2 additions & 1 deletion Doc/reference/datamodel.rst
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Expand Up @@ -1927,7 +1927,8 @@ Preparing the class namespace
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).
additional keyword arguments, if any, come from the class definition). The
``__prepare__`` method should be implemented as a :func:`classmethod`.

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