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

oseg
0.3.dev0

This version was deleted from PyPI around 2025-08-05. Installing fails with:
$ pip3 install oseg==0.3.dev0 ERROR: Could not find a version that satisfies the requirement oseg==0.3.dev0
View other deleted versions of oseg

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/2025-08-04/ \ oseg==0.3.dev0
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Or, download files manually

And install manually via pip:
oseg-0.3.dev0-py3-none-any.whl (7.8KB)
oseg-0.3.dev0.tar.gz (26.4KB)