There are some things really neat in the switf example that they compare to python, like the literal range similar to ruby's, the fact that "+" is a function like in lisp, although I'm really not fan of the CFAbsoluteTimeGetCurrent().

But the python example doesn't make me trust the rest of the article. It is clearly a swift example, translated verbatim to python.

Idiomatic Python would be this:

    import time
    for it in range(15):           
        start = time.time()        
        total = sum((it,) * 3000)
        end = time.time()     
        print(end - start, total)  

Which is shorter, and way faster.

Now of course, Python is slower than swift (although a numpy version would not be, but I get it's not relevant in general purpose machine learning). But misrepresenting a language is not a good way to make a point.