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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`_csv` `Reader` and `Writer` types shouldn't be directly instantiable","articleBody":"The accepted way to create these objects is to use constructor functions `_csv.reader()` and `_csv.writer()` with appropriate arguments. Objects that are created through type constructors `_csv.Reader` and `_csv.Writer` turn out to be not properly initialized, and operations on them easily lead to crash:\r\n```python\r\n\u003e\u003e\u003e import _csv\r\n\u003e\u003e\u003e _csv.Writer().writerow([])\r\nSegmentation fault (core dumped)\r\n```\r\n```python\r\n\u003e\u003e\u003e import _csv\r\n\u003e\u003e\u003e list(_csv.Reader())\r\nSegmentation fault (core dumped)\r\n```\r\nAlthough this is an internal detail, I'm sure that this should be fixed. I'll submit a PR shortly.\r\nThe crash appears on 3.10, 3.11 and current main.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104266\n* gh-104278\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/chgnrdv","@type":"Person","name":"chgnrdv"},"datePublished":"2023-05-07T12:24:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/104265/cpython/issues/104265"}