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

code-evaluator-kernel
1.0.0a0

This version was deleted from PyPI around 2023-11-09. Installing fails with:
$ pip3 install code-evaluator-kernel==1.0.0a0 ERROR: Could not find a version that satisfies the requirement code-evaluator-kernel==1.0.0a0
View other deleted versions of code-evaluator-kernel

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/2023-11-08/ \ code-evaluator-kernel==1.0.0a0
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Or, download files manually

And install manually via pip:
Code_Evaluator_Kernel-1.0.0a0-py3-none-any.whl (21.6KB)
Code-Evaluator-Kernel-1.0.0a0.tar.gz (17.1KB)