gh-140196: Added constructor behavior changes in ast.rst for python 3.13 #140243
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…es in ast.rst for Python 3.13
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Summary
This adds a
.. versionchanged:: 3.13note toast.rstdocumenting that AST node constructors now provide sensible defaults for omitted fields in Python 3.13: optional fields default toNone, list fields default to an empty list, and fields of type :class:ast.expr_contextdefault to :class:Load() <ast.Load>Issue
#140196
📚 Documentation preview 📚: https://cpython-previews--140243.org.readthedocs.build/