You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
pychatz was reported malicious
OSV:MAL-2026-2291 - Malicious code in pychatz (PyPI)

pychatz
1.0.1

This version was deleted from PyPI around 2026-03-31. Installing fails with:
$ pip3 install pychatz==1.0.1 ERROR: Could not find a version that satisfies the requirement pychatz==1.0.1
View other deleted versions of pychatz

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/2026-03-30/ \ pychatz==1.0.1
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Or, download files manually

And install manually via pip:
pychatz-1.0.1-py3-none-any.whl (2.5KB)
pychatz-1.0.1.tar.gz (1.8KB)