René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Specialize syntax error for trailing comma of last item in `with`","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nConsider a specialized syntax error for these cases:\n\n```python\nwith item,: pass\nwith item as x,: pass\n```\n\nwhereas this would be correct syntax:\n\n```python\nwith (item,): pass\nwith (item as x,): pass\n```\n\nThis was taken from https://github.com/astral-sh/ruff/blob/6ff4da454c448f01eb0b71728f3941870c811bfc/crates/ruff_python_parser/resources/invalid/statements/with/unparenthesized_with_items.py. 2+ years in Ruff's parser.\n\nI'm not sure what the better message could be. Maybe one of these:\n\n```\n❯ ./python.exe t.py\n  File \"/Users/bartosz.slawecki/Python/cpython/t.py\", line 1\n    with item,: pass\n              ^\nSyntaxError: single 'with' item has a trailing comma                 # this tells me what's wrong\nSyntaxError: single 'with' item is followed by a comma               # this tells me about a violated rule\nSyntaxError: this 'with' statement cannot end with a trailing comma  # this sets a rule\nSyntaxError: single 'with' item cannot be followed by a comma        # this is not always true :-)\n```\n\nOnly this specific case seems to require parentheses to pass.\nFor instance, I could also do:\n\n```python\nwith a, b: pass\n```\n\nOr maybe we could allow no parentheses at all? But that's probably much more work for an edge case, would it be worth it?\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-145282\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/johnslavik","@type":"Person","name":"johnslavik"},"datePublished":"2026-02-26T02:07:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/145241/cpython/issues/145241"}