OK, I have reviewed the PEP and the discussion here, and I’d like to formally accept this PEP. Congratulations to everyone involved on a well-written PEP and a well-managed discussion 
Could someone update the PEP to reflect this decision, please?
I do have a couple of minor points which might be worth clarifying in the PEP, neither of which affect the decision as they only relate to the recommendations part of the document.
- Issue 43976: Allow Python distributors to add custom site install schemes - Python tracker is still not implemented at this point. It was noted in the discussion that this issue and the PEP were independent, so this is not a problem, but it might be clearer if the PEP explicitly added a note along the lines of “(when this feature is implemented)”.
- The table in “Use cases” for “Distro Python in Docker” says “assuming the Docker image removes the marker file”, but the later recommendation section suggests that distros keep the marker in container images. From the discussion here, I understand the recommendation section to be the preferred option, so the table should probably be clarified to reflect that.