Multiple python versions still isn't exactly hard with pip+venv. If you want a different python version for your venv, just use that python version to install t

Multiple python versions still isn't exactly hard with pip+venv. If you want a different python version for your venv, just use that python version to install the venv. Package repositories not providing the python version you need? Python is surprisingly easy to compile from source. Different OSes is a bit more annoying. I tend to just get VMs involved and do the build on the target OS.