I came across this PEP a few weeks ago and thought it was really interesting. I wrote a blog post about it and a proof of concept called pythonloc. Overall I like the idea, but I think some minor implementation changes can have big changes on how useful and adopted this feature becomes. I wanted to share some of my feedback here. Falling back to site-packages reduces usefulness of __pypackages__ If I am developing an app or library and I want to test it, I need to know exactly which packages ...