what's happening is that we use Pex to do interpreter discovery. But before that happens, we need to find a Python interpreter to run Pex itself: https://www.pantsbuild.org/docs/reference-pex#section-bootstrap-interpreter-names Pex works w/ Py27 and Py3, hence we consider if

python2

is there. But we shouldn't be failing. You can try changing that option, although definitely interested in the error