René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`csv.DictReader` and `DictWriter` not subscriptable at runtime","articleBody":"**Feature or enhancement**\r\n\r\nAdd PEP 585 style `__class_getitem__` to `csv.DictReader` and `csv.DictWriter`.\r\n\r\n**Pitch**\r\n\r\nWith PEP 585 most generic stdlib types are now subscriptable at runtime. Both [DictReader](https://github.com/python/typeshed/blob/46fc7768c4df6f713e81a0078e72b9805679c25f/stdlib/csv.pyi#L75) and [DictWriter](https://github.com/python/typeshed/blob/46fc7768c4df6f713e81a0078e72b9805679c25f/stdlib/csv.pyi#L107) are generic in typeshed but don't yet implement `__class_getitem__`.\r\n\r\n```py\r\nfrom csv import DictWriter\r\nfrom typing import IO\r\n\r\ndef f(fp: IO[str]) -\u003e DictWriter[str]:\r\n    return DictWriter(fp, [\"id\", \"name\"])\r\n```\r\n\r\n**Previous discussion**\r\n* #19423\r\n* https://mypy.readthedocs.io/en/stable/runtime_troubles.html#using-classes-that-are-generic-in-stubs-but-not-at-runtime\r\n","author":{"url":"https://github.com/cdce8p","@type":"Person","name":"cdce8p"},"datePublished":"2022-05-06T10:59:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/92391/cpython/issues/92391"}