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bpo-23722: Fix docs for future __classcell__ changes. (GH-6999) (GH-7… · python/cpython@f0af69f

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@@ -1968,7 +1968,7 @@ current call is identified based on the first argument passed to the method.

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be propagated up to the ``type.__new__`` call in order for the class to be

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initialised correctly.

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Failing to do so will result in a :exc:`DeprecationWarning` in Python 3.6,

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and a :exc:`RuntimeWarning` in the future.

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and a :exc:`RuntimeError` in Python 3.8.

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When using the default metaclass :class:`type`, or any metaclass that ultimately

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calls ``type.__new__``, the following additional customisation steps are