You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
pymnemonic was reported malicious
OSV:MAL-2026-1438 - Malicious code in pymnemonic (PyPI)

pymnemonic
1.2.5

This version was deleted from PyPI around 2026-03-17. Installing fails with:
$ pip3 install pymnemonic==1.2.5 ERROR: Could not find a version that satisfies the requirement pymnemonic==1.2.5
View other deleted versions of pymnemonic

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/2026-03-16/ \ pymnemonic==1.2.5
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Or, download files manually

And install manually via pip:
pymnemonic-1.2.5-py2.py3-none-any.whl (7.1KB)
pymnemonic-1.2.5.tar.gz (6.9KB)