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

planetpy
0.4.4

This version was deleted from PyPI around 2024-02-13. Installing fails with:
$ pip3 install planetpy==0.4.4 ERROR: Could not find a version that satisfies the requirement planetpy==0.4.4
View other deleted versions of planetpy

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/2024-02-12/ \ planetpy==0.4.4
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Or, download files manually

And install manually via pip:
planetpy-0.4.4-py2.py3-none-any.whl (20.9KB)
planetpy-0.4.4.tar.gz (29.2KB)