What’s wrong with list comprehensions? Do I just have Stockholm Syndrome at this point?

I would skip the square brackets and just use a generator expression: sum(3*n for n in range(5)).

Yes, the classic readability of c style for loops.

How about some Haskell

let numbers = [1, 2, 3, 4, 5] let sumOfNumbers = sum numbers

I don’t think you can use python list comprehensions in this case, since you don’t want a new list, but rather reduce it to a single value.