You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
test421 was reported malicious
OSV:MAL-2025-48899 - Malicious code in test421 (PyPI)

test421

This package was deleted from PyPI around 2025-10-10. Installing fails with:
$ pip3 install test421 ERROR: Could not find a version that satisfies the requirement test421 (from versions: none) ERROR: No matching distribution found for test421

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-10-09/ \ test421
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Or, download files manually

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1.0.1