René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"csv.writer: embedded \\r/\\n not quoted with a custom lineterminator (QUOTE_MINIMAL)","articleBody":"## Feature\n\n\u003c!-- What Python feature is missing from RustPython? Give a short description of the feature and how you ran into its absence. --\u003e\n\nFollow-up from #8254 (found by @doma17).\n\nWith `QUOTE_MINIMAL` and a custom `lineterminator` (not CR/LF), embedded `\\r`/`\\n` in a field are not quoted, so the output differs from CPython.\n\n```python\nimport csv, io\nsio = io.StringIO()\ncsv.writer(sio, lineterminator=\"!\").writerow([\"\\r\", \"\\n\"])\nprint(repr(sio.getvalue()))\n# CPython:    '\"\\r\",\"\\n\"!'\n# RustPython: '\\r,\\n!'\n```\n\nCPython always quotes fields containing `\\r`/`\\n` regardless of the lineterminator. (Not a regression from #8254 — same on `develop`.)\n\n## Python Documentation or reference to CPython source code\n\n\u003c!-- Give a link to the feature in the CPython documentation (https://docs.python.org/3/) in order to assist in its implementation. --\u003e\n\nhttps://docs.python.org/3/library/csv.html#csv.QUOTE_MINIMAL\n\n---\n_Re-created from #8302, which was closed by accident._\n","author":{"url":"https://github.com/jinmay","@type":"Person","name":"jinmay"},"datePublished":"2026-07-18T14:22:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/8317/RustPython/issues/8317"}