René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Document missing AST node constructor behavior changes in ast.rst for python 3.13","articleBody":"## Documentation\n\nIn Python 3.13, AST node constructors now provide defaults for the omitted fields:\n\n* Optional fields: default to `None`\n* List fields: default to an empty list\n* `expr_context` fields: default to `Load()`\n\nPreviously in Python 3.12 and earlier, these omitted fields would not exist as attributes, causing `AttributeError` when accessed.\n\nThese information can be found in [What’s New In Python 3.13](https://docs.python.org/3/whatsnew/3.13.html#ast), but not in the [`ast` documentation](https://docs.python.org/3/library/ast.html#) itself.\n\nSince this is a significant behavioral change, it should be documented in the `ast` module documentation with a `.. versionchanged:: 3.13` directive.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-140243\n* gh-146351\n* gh-146354\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/revdoor","@type":"Person","name":"revdoor"},"datePublished":"2025-10-16T08:13:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/140196/cpython/issues/140196"}