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

jianfeng-py-test
1.1.353a2

This version was deleted from PyPI around 2024-06-21. Installing fails with:
$ pip3 install jianfeng-py-test==1.1.353a2 ERROR: Could not find a version that satisfies the requirement jianfeng-py-test==1.1.353a2
View other deleted versions of jianfeng-py-test

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/2024-06-20/ \ jianfeng-py-test==1.1.353a2
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Or, download files manually

And install manually via pip:
jianfeng_py_test-1.1.353a2-py3-none-any.whl (2.5MB)
jianfeng-py-test-1.1.353a2.tar.gz (1.3MB)