You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
dev-server-python was reported malicious
OSV:MAL-2025-191717 - Malicious code in dev-server-python (PyPI)

dev-server-python

This package was deleted from PyPI around 2025-12-03. Installing fails with:
$ pip3 install dev-server-python ERROR: Could not find a version that satisfies the requirement dev-server-python (from versions: none) ERROR: No matching distribution found for dev-server-python

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-12-02/ \ dev-server-python
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99.9.9