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Diffstat (limited to 'Doc/whatsnew/3.6.rst')
| -rw-r--r-- | Doc/whatsnew/3.6.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst index 5b5884d..040a533 100644 --- a/Doc/whatsnew/3.6.rst +++ b/Doc/whatsnew/3.6.rst @@ -351,6 +351,11 @@ whenever a new subclass is created:: class Plugin2(PluginBase): pass +In order to allow zero-argument :func:`super` calls to work correctly from +:meth:`~object.__init_subclass__` implementations, custom metaclasses must +ensure that the new ``__classcell__`` namespace entry is propagated to +``type.__new__`` (as described in :ref:`class-object-creation`). + .. seealso:: :pep:`487` -- Simpler customization of class creation @@ -2235,6 +2240,11 @@ Changes in the Python API on a ZipFile created with mode ``'r'`` will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised in those scenarios. +* when custom metaclasses are combined with zero-argument :func:`super` or + direct references from methods to the implicit ``__class__`` closure + variable, the implicit ``__classcell__`` namespace entry must now be passed + up to ``type.__new__`` for initialisation. Failing to do so will result in + a :exc:`DeprecationWarning` in 3.6 and a :exc:`RuntimeWarning` in the future. Changes in the C API -------------------- |