You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
requests-os was reported malicious
OSV:MAL-2025-191657 - Malicious code in requests-os (PyPI)

requests_os

This package was deleted from PyPI around 2025-10-18. Installing fails with:
$ pip3 install requests_os ERROR: Could not find a version that satisfies the requirement requests_os (from versions: none) ERROR: No matching distribution found for requests_os

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-10-17/ \ requests_os
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1.0.0