You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
xmlbuilder3 was reported malicious
OSV:MAL-2023-8309 - Malicious code in xmlbuilder3 (PyPI)

xmlbuilder3

This package was deleted from PyPI around 2023-10-12. Installing fails with:
$ pip3 install xmlbuilder3 ERROR: Could not find a version that satisfies the requirement xmlbuilder3 (from versions: none) ERROR: No matching distribution found for xmlbuilder3

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/2023-10-11/ \ xmlbuilder3
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Or, download files manually

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0.0.1
0.0.2