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gh-132604: Track deprecation related to runtime-checkable protocols (3.20) #154790

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gh-132604: Track deprecation related to runtime-checkable protocols (3.20) #154790

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Track deprecation related to runtime-checkable protocols until 3.20
johnslavik Jul 27, 2026
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Merge branch 'main' into gh-132604-track-deprecation
johnslavik Jul 27, 2026
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9 changes: 9 additions & 0 deletions Doc/deprecations/pending-removal-in-3.20.rst
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Expand Up @@ -53,3 +53,12 @@ Pending removal in Python 3.20

* Creating instances of abstract AST nodes (such as :class:`ast.AST`
or :class:`!ast.expr`) is deprecated and will raise an error in Python 3.20.

* :mod:`typing`:

* It is deprecated to call :func:`isinstance` and :func:`issubclass` checks on
protocol classes that were not explicitly decorated with :func:`!runtime_checkable`
but that inherit from a runtime-checkable protocol class.
This will raise a :exc:`TypeError` in Python 3.20.

(Contributed by Bartosz Sławecki in :gh:`132604`.)
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