From: Parman Mohammadalizadeh <prmma23@gmail.com>
Date: Tue, 24 Mar 2026 00:51:31 +0000 (+0000)
Subject: gh-140196: Added constructor behavior changes in ast.rst for python 3.13 (GH-140243)
X-Git-Tag: v3.15.0a8~196
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fae5761a762a587b48430cbcd6e1886034ae8130;p=thirdparty%2FPython%2Fcpython.git

gh-140196: Added constructor behavior changes in ast.rst for python 3.13 (GH-140243)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
---

diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
index 9660ad709327..9b4e7ae18348 100644
--- a/Doc/library/ast.rst
+++ b/Doc/library/ast.rst
@@ -131,6 +131,14 @@ 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() <ast.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