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

c7n-left
0.3.6

This version was deleted from PyPI around 2023-10-05. Installing fails with:
$ pip3 install c7n-left==0.3.6 ERROR: Could not find a version that satisfies the requirement c7n-left==0.3.6
View other deleted versions of c7n-left

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/2023-10-04/ \ c7n-left==0.3.6
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Or, download files manually

And install manually via pip:
c7n_left-0.3.6-py3-none-any.whl (37.9KB)
c7n_left-0.3.7-py3-none-any.whl (42.7KB)