I believe that's essentially what Cython allows you to do, by way of C. Since the Cython compiler isn't especially advanced, it requires some hints to get good

I believe that's essentially what Cython allows you to do, by way of C. Since the Cython compiler isn't especially advanced, it requires some hints to get good performance, which is why Cython code is usually typed, structured more like C, etc. But still, it executes on your basic idea.