You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
testospkg was reported malicious
OSV:MAL-2025-1997 - Malicious code in testospkg (PyPI)

testospkg

This package was deleted from PyPI around 2025-01-29. Installing fails with:
$ pip3 install testospkg ERROR: Could not find a version that satisfies the requirement testospkg (from versions: none) ERROR: No matching distribution found for testospkg

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/2025-01-28/ \ testospkg
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Or, download files manually

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0.0.1
0.0.2
0.0.3