This had a lot of cruft that is not needed with nox. First, the working directory is guaranteed to be the noxfile directory, so all the path stuff wasn't needed. Second, we now support default=False, so use that. Third, we don't support multiline help yet so all the extra stuff isn't visible unless you are looking at the code anyway. Finally, we can just use the correct path to pip. We could use external pip instead, and leave it out of the dev environment, but this seems fine as an example.