Julia should be a much easier transition for a python programmer than Swift would be. If your argument is that swift can just be called from python so that the

Julia should be a much easier transition for a python programmer than Swift would be. If your argument is that swift can just be called from python so that the python programmers don't have to touch it directly, then I'd say: 1) That's not the most robust solution, especially for deep learning because auto-diff tools don't cross language barriers well 2) If you have an argument for why 1) isn't a big deal, then the next step would be demonstrating why that argument doesn't apply to julia just as well (if not better) than Swift. In fact, Julia has a great interoperability story with other languages, one good example is DiffEqPy and DiffEqR which are Python and R packages respectively for accessing julia's state of the art DifferentialEquations library.