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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"User subclasses of `pathlib.PurePath` are `os.PathLike`","articleBody":"In Python 3.12 we've made `pathlib.PurePath` subclassable - see #31691.\r\n\r\nA significant wrinkle is that subclasses inherit an `__fspath__()` method, which can lead to unexpected behaviour when these \"pure\" paths are passed to filesystem APIs:\r\n\r\n```python\r\nimport pathlib\r\n\r\nclass TarPath(pathlib.PurePath):\r\n    ...\r\n\r\nreadme = TarPath('README.md', tarfile=...)\r\nwith open(readme) as f:\r\n   ...\r\n```\r\n\r\nThe `with open(readme) as f:` line should throw a `TypeError`, but instead it attempts to open a file called README.md in the current working directory (!). This sort of thing makes subclasses that implement purely virtual filesystems difficult to use safely.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-106043\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/barneygale","@type":"Person","name":"barneygale"},"datePublished":"2023-06-23T17:03:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/106037/cpython/issues/106037"}