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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Zipfile module doesn't replace `os.altsep` in filenames in some cases","articleBody":"The zipfile module currently doesn't replace `os.altsep` with `/` in filename in cases where `os.altsep` is not `None` and not `\"/\"`.\r\n\r\nI'm not currently aware of any cases where `os.altsep` is not `None` or `\"/\"`, so I don't think this is currently causing any issues, but it's at least not consistent with [the documentation](https://docs.python.org/3/library/os.html#os.altsep) which states that `os.altsep` is \"An alternative character used by the operating system to separate pathname components\".\r\n\r\nTo reproduce the issue, the code below manually sets `os.sep` and `os.altsep` to be the normal Windows values, then swaps them. This should have no effect on the resulting zip file since the values should both be treated as valid path separators.\r\n\r\n```python\r\nimport io\r\nimport ntpath\r\nimport os\r\nimport zipfile\r\n\r\ndef show_zip():\r\n    zf = zipfile.ZipFile(io.BytesIO(), 'w')\r\n    zf.writestr(\"a/b/\", \"\")\r\n    zf.writestr(\"a/b\\\\\", \"\")\r\n    zf.writestr(\"a\\\\b/\", \"\")\r\n    zf.writestr(\"a\\\\b\\\\\", \"\")\r\n    print([x.filename for x in zf.infolist()])\r\n\r\nos.sep = ntpath.sep\r\nos.altsep = ntpath.altsep\r\nshow_zip()\r\n\r\nos.altsep, os.sep = os.sep, os.altsep\r\nshow_zip()\r\n```\r\n\r\nExpected output:\r\n```\r\n['a/b/', 'a/b/', 'a/b/', 'a/b/']\r\n['a/b/', 'a/b/', 'a/b/', 'a/b/']\r\n```\r\n\r\nActual output:\r\n```\r\n['a/b/', 'a/b/', 'a/b/', 'a/b/']\r\n['a/b/', 'a/b\\\\', 'a\\\\b/', 'a\\\\b\\\\']\r\n```\r\n\r\nEnvironment: `Python 3.11.0a7+ (heads/main:56f9844014, May  2 2022, 15:22:18) [Clang 11.0.0 (clang-1100.0.33.17)] on darwin`\r\n\r\n\u003c!-- gh-linked-prs --\u003e\r\n### Linked PRs\r\n* gh-92185\r\n\u003c!-- /gh-linked-prs --\u003e\r\n","author":{"url":"https://github.com/pR0Ps","@type":"Person","name":"pR0Ps"},"datePublished":"2022-05-02T20:13:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/92184/cpython/issues/92184"}