The most common scenario for using Cython with NumPy is one where you want to take a NumPy array, iterate over it, and perform computations on each element that can’t be done readily in NumPy.

I wrote the demo using the 3.6.5 version of Python and the 1.14.3 version of NumPy but any relatively recent versions will work fine. It's possible to install Python and NumPy separately, however, if ...