From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Date: Tue, 24 Mar 2026 01:37:09 +0000 (+0100) Subject: [3.14] gh-140196: Added constructor behavior changes in ast.rst for python 3.13 ... X-Git-Tag: v3.14.4~76 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ac2fff4c0e197fe3a01b3029d315f1645815eee0;p=thirdparty%2FPython%2Fcpython.git [3.14] gh-140196: Added constructor behavior changes in ast.rst for python 3.13 (GH-140243) (GH-146351) (cherry picked from commit fae5761a762a587b48430cbcd6e1886034ae8130) Co-authored-by: Parman Mohammadalizadeh Co-authored-by: Łukasz Langa --- diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst index d2bff5735883..31c406c62b17 100644 --- a/Doc/library/ast.rst +++ b/Doc/library/ast.rst @@ -134,6 +134,14 @@ Node classes Simple indices are represented by their value, extended slices are represented as tuples. +.. versionchanged:: 3.13 + + AST node constructors were changed to provide sensible defaults for omitted + fields: optional fields now default to ``None``, list fields default to an + empty list, and fields of type :class:`!ast.expr_context` default to + :class:`Load() `. Previously, omitted attributes would not exist on constructed + nodes (accessing them raised :exc:`AttributeError`). + .. versionchanged:: 3.14 The :meth:`~object.__repr__` output of :class:`~ast.AST` nodes includes