Apparently, showing a warning during install of a python pkg is not a thing you can actually do when using pip install (oops).
Instead of adding a warning to the pip output, I can remove all python srcs from master and re-write the setup.py (on master) to redirect installation to the newer package on PyPI.

from setuptools import setup setuptools.setup( name="cpp-linter-deprecated", version="0.0.0", install_requires=["cpp-linter"], py_modules=[""], )

Originally posted by @2bndy5 in #87 (comment)

This will also avoid errors like the one reported in #94