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

21cmmc
1.0.0.dev0

This version was deleted from PyPI around 2026-08-05. Installing fails with:
$ pip3 install 21cmmc==1.0.0.dev0 ERROR: Could not find a version that satisfies the requirement 21cmmc==1.0.0.dev0
View other deleted versions of 21cmmc

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/2026-08-04/ \ 21cmmc==1.0.0.dev0
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:
21CMMC-1.0.0.dev0-py3-none-any.whl (122.7KB)
21CMMC-1.0.0.dev0.tar.gz (109.9KB)