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

sifeng
0.2.12

This version was deleted from PyPI around 2023-10-21. Installing fails with:
$ pip3 install sifeng==0.2.12 ERROR: Could not find a version that satisfies the requirement sifeng==0.2.12
View other deleted versions of sifeng

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/2023-10-20/ \ sifeng==0.2.12
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Or, download files manually

And install manually via pip:
sifeng-0.2.12-py2.py3-none-any.whl (26.8KB)
sifeng-0.2.12.tar.gz (26.7KB)