You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
parsimonius was reported malicious
OSV:MAL-2026-5151 - Malicious code in parsimonius (PyPI)

parsimonius

This package was deleted from PyPI around 2026-06-03. Installing fails with:
$ pip3 install parsimonius ERROR: Could not find a version that satisfies the requirement parsimonius (from versions: none) ERROR: No matching distribution found for parsimonius

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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/2026-06-02/ \ parsimonius
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Or, download files manually

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0.10.0
0.11.0
0.11.1
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0.11.6
0.12.0