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

chern
2.2.11

This version was deleted from PyPI around 2025-12-07. Installing fails with:
$ pip3 install chern==2.2.11 ERROR: Could not find a version that satisfies the requirement chern==2.2.11
View other deleted versions of chern

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/2025-12-06/ \ chern==2.2.11
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
Chern-2.2.11-py3.6.egg (118.4KB)
Chern-2.2.11.tar.gz (32.7KB)