https://github.com/python/cpython/commit/806c997f55a5460c3dcabc022dcf275220b3d46e commit: 806c997f55a5460c3dcabc022dcf275220b3d46e branch: main author: Jeff Epler <[email protected]> committer: JelleZijlstra <[email protected]> date: 2026-05-18T11:20:49-07:00 summary:
gh-140344: ast: Add deprecation warnings (#140345) These were all deprecated in 3.9 (bace59d8b8) but without a runtime deprecation warning. Add it now, so that these items can be removed in 3.21 per PEP 387. Co-authored-by: Jelle Zijlstra <[email protected]> files: A Doc/deprecations/pending-removal-in-3.21.rst A Misc/NEWS.d/next/Library/2025-10-20-09-12-18.gh-issue-140344.WjbYg-.rst M Doc/deprecations/index.rst M Doc/whatsnew/3.16.rst M Lib/ast.py M Lib/test/test_ast/test_ast.py diff --git a/Doc/deprecations/index.rst b/Doc/deprecations/index.rst index eedcd2e9c9dd42..50e1b126fd1346 100644 --- a/Doc/deprecations/index.rst +++ b/Doc/deprecations/index.rst @@ -13,6 +13,8 @@ Deprecations .. include:: pending-removal-in-3.20.rst +.. include:: pending-removal-in-3.21.rst + .. include:: pending-removal-in-future.rst .. include:: soft-deprecations.rst diff --git a/Doc/deprecations/pending-removal-in-3.21.rst b/Doc/deprecations/pending-removal-in-3.21.rst new file mode 100644 index 00000000000000..5d0c56612094ff --- /dev/null +++ b/Doc/deprecations/pending-removal-in-3.21.rst @@ -0,0 +1,10 @@ +Pending removal in Python 3.21 +------------------------------ + +* :mod:`ast`: + + * Classes ``slice``, ``Index``, ``ExtSlice``, ``Suite``, ``Param``, + ``AugLoad`` and ``AugStore``, will be removed in Python 3.21. These types + are not generated by the parser or accepted by the code generator. + * The ``dims`` property of ``ast.Tuple`` will be removed in Python 3.21. Use + the ``ast.Tuple.elts`` property instead. diff --git a/Doc/whatsnew/3.16.rst b/Doc/whatsnew/3.16.rst index 9383ce5665993e..2e5342e4f02053 100644 --- a/Doc/whatsnew/3.16.rst +++ b/Doc/whatsnew/3.16.rst @@ -184,9 +184,16 @@ tarfile Deprecated ========== -* module_name: - TODO - +* :mod:`ast`: + + * Classes ``slice``, ``Index``, ``ExtSlice``, ``Suite``, ``Param``, + ``AugLoad`` and ``AugStore``, deprecated since Python 3.9, are no longer + imported by ``from ast import *`` and issue a deprecation warning on + use. The classes are slated for removal in Python 3.21. These types are not + generated by the parser or accepted by the code generator. + * The ``dims`` property of ``ast.Tuple`` objects, deprecated since Python + 3.9, now issues a deprecation warning on use. This property is slated for + removal in 3.21. Use ``ast.Tuple.elts`` instead. .. Add deprecations above alphabetically, not here at the end. diff --git a/Lib/ast.py b/Lib/ast.py index 4f88a554344cc9..f445b32040e5fb 100644 --- a/Lib/ast.py +++ b/Lib/ast.py @@ -21,7 +21,7 @@ :license: Python License. """ from _ast import * - +lazy import warnings def parse(source, filename='<unknown>', mode='exec', *, type_comments=False, feature_version=None, optimize=-1, module=None): @@ -630,9 +630,11 @@ def __new__(cls, dims=(), **kwargs): def _dims_getter(self): """Deprecated. Use elts instead.""" + warnings._deprecated(f"ast.Tuple.dims", remove=(3, 21)) return self.elts def _dims_setter(self, value): + warnings._deprecated(f"ast.Tuple.dims", remove=(3, 21)) self.elts = value Tuple.dims = property(_dims_getter, _dims_setter) @@ -714,5 +716,23 @@ def main(args=None): color=can_colorize(file=sys.stdout), indent=args.indent, show_empty=args.show_empty)) +_deprecated = { + 'slice': globals().pop("slice"), + 'Index': globals().pop("Index"), + 'ExtSlice': globals().pop("ExtSlice"), + 'Suite': globals().pop("Suite"), + 'AugLoad': globals().pop("AugLoad"), + 'AugStore': globals().pop("AugStore"), + 'Param': globals().pop("Param") +} + +def __getattr__(attr): + try: + val = _deprecated[attr] + except KeyError: + raise AttributeError(f"module 'ast' has no attribute {attr!r}") from None + warnings._deprecated(f"ast.{attr}", remove=(3, 21)) + return val + if __name__ == '__main__': main() diff --git a/Lib/test/test_ast/test_ast.py b/Lib/test/test_ast/test_ast.py index af8b334da03e70..0112c9163fd0cd 100644 --- a/Lib/test/test_ast/test_ast.py +++ b/Lib/test/test_ast/test_ast.py @@ -523,6 +523,12 @@ def test_classattrs(self): self.assertIs(ast.Constant(None).value, None) self.assertIs(ast.Constant(...).value, ...) + with self.assertWarns(DeprecationWarning): + ast.Tuple().dims + + with self.assertWarns(DeprecationWarning): + ast.Tuple().dims = 3 + def test_constant_subclasses(self): class N(ast.Constant): def __init__(self, *args, **kwargs): @@ -1100,6 +1106,38 @@ def test_tstring(self): self.assertIsInstance(tree.body[0].value.values[0], ast.Constant) self.assertIsInstance(tree.body[0].value.values[1], ast.Interpolation) + def test_deprecated(self): + with self.assertWarns(DeprecationWarning): + ast.slice + + with self.assertWarns(DeprecationWarning): + ast.Index + + with self.assertWarns(DeprecationWarning): + ast.ExtSlice + + with self.assertWarns(DeprecationWarning): + ast.Suite + + with self.assertWarns(DeprecationWarning): + ast.AugLoad + + with self.assertWarns(DeprecationWarning): + ast.AugStore + + with self.assertWarns(DeprecationWarning): + ast.Param + + namespace = {} + exec("from ast import *", namespace) + self.assertNotIn("slice", namespace) + self.assertNotIn("Index", namespace) + self.assertNotIn("ExtSlice", namespace) + self.assertNotIn("Suite", namespace) + self.assertNotIn("AugLoad", namespace) + self.assertNotIn("AugStore", namespace) + self.assertNotIn("Param", namespace) + def test_filter_syntax_warnings_by_module(self): filename = support.findfile('test_import/data/syntax_warnings.py') with open(filename, 'rb') as f: @@ -1139,8 +1177,9 @@ def iter_ast_classes(): def do(cls): if cls.__module__ != 'ast': return - if cls is ast.Index: - return + with warnings.catch_warnings(action="ignore", category=DeprecationWarning): + if cls is ast.Index: + return # Don't attempt to create instances of abstract AST nodes if _ast._is_abstract(cls): return diff --git a/Misc/NEWS.d/next/Library/2025-10-20-09-12-18.gh-issue-140344.WjbYg-.rst b/Misc/NEWS.d/next/Library/2025-10-20-09-12-18.gh-issue-140344.WjbYg-.rst new file mode 100644 index 00000000000000..ca3046941c6c93 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2025-10-20-09-12-18.gh-issue-140344.WjbYg-.rst @@ -0,0 +1,11 @@ +The classes ``ast.slice``, ``ast.ExtSlice``, ``ast.Index``, ``ast.Suite``, ``ast.AugLoad``, +``ast.AugStore``, and ``ast.Param``, deprecated since Python 3.9, now issue +deprecation warnings on use. They are now scheduled for removal in Python 3.21. + +The ``dims`` property of ``ast.Tuple`` objects, deprecated since Python 3.9, +now issues a deprecation warning when accessed. The property is scheduled for +removal in Python 3.21. Use the (non-deprecated) ``elts`` property of +``ast.Tuple`` objects instead. + +The deprecated global names are also no longer imported by +``from ast import *``. _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
