You are right, the article is wrong. It is most certainly not lazy. f(g(), h()) will always call both h and g regardless of whether f uses their results. Itera

You are right, the article is wrong. It is most certainly not lazy. f(g(), h()) will always call both h and g regardless of whether f uses their results. Iteration in a sense can be "lazy", but that laziness is via data structures built on top of a strict core language. Python is not alone in having lazy iteratable data structures, but it leans into them relatively hard in its standard library. Many of us love this, as it lets for loops work elegantly over all sorts of abstractions, but I could see some folks disliking it. Still, the author does not explain this nuance, which makes me think he does not quite know what he is talking about.