You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

py3-test
0.3.0

This version was deleted from PyPI around 2024-07-26. Installing fails with:
$ pip3 install py3-test==0.3.0 ERROR: Could not find a version that satisfies the requirement py3-test==0.3.0
View other deleted versions of py3-test

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/2024-07-25/ \ py3-test==0.3.0
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Or, download files manually

And install manually via pip:
py3_test-0.3.0-py3-none-any.whl (47.1MB)
py3_test-0.3.0.tar.gz (47.0MB)