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[3.13] gh-140196: Added constructor behavior changes in ast.rst for python 3.13 (GH-140243) #146354

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ambv merged 1 commit into from
Mar 24, 2026
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[3.13] gh-140196: Added constructor behavior changes in ast.rst for python 3.13 (GH-140243) #146354

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8 changes: 8 additions & 0 deletions Doc/library/ast.rst
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Expand Up @@ -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() <ast.Load>`. Previously, omitted attributes would not exist on constructed
nodes (accessing them raised :exc:`AttributeError`).

.. deprecated:: 3.8

Old classes :class:`!ast.Num`, :class:`!ast.Str`, :class:`!ast.Bytes`,
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