I have a bunch of python installations that I use for development. I do not have them on the path, because I don't want to override the system python, and I frequently need to run other custom Python installations.

As these pythons are not on the path, tox won't find them. I expected that there was some way to configure tox to where they are, but it seems not. I can change it in the projects tox.ini, but obviously then that tox.ini would fail for anyone else.

So I therefore propose a ~/.tox/config file which is loaded with defaults, that are overridden by the project tox.ini. This would allow me to specify where my python exes are for each environment.

This would also help with defining a global toxworkdir, if I don’t want to have the virtualenvs created under my project directory but somewhere else, without imposing it on other contributors.