In python, I hate hate hate having to do import numpy import scipy.sparse import scipy.sparse.linalg just to begin writing something. You cannot

In python, I hate hate hate having to do import numpy import scipy.sparse import scipy.sparse.linalg just to begin writing something. You cannot create a literal array without calling a function. You cannot concatenate arrays without calling a function, and moreover this function has a different name depending on whether your arrays are full or sparse. The @ notation for matrix products is horrendous (and .dot is even worse). Arrays are not first-class objects of the language, and you have to use an external library. This is more infuriating by the fact that other, more complex data structures like dictionaries or strings are natively supported, even if they are mostly useless for numerical computation. Compare the clean matrix flipping in octave z = [ kron(speye(rows(y)), x) ; kron(y, speye(cols(x))) ] to the python monstrosity z = scipy.sparse.vstack([ scipy.sparse.kron(scipy.sparse.eye(y.shape[0]), x), scipy.sparse.kron(y, scipy.sparse.eye(x.shape[1])) ])