Modifying list elements in a for loop

Question

I have a list a for which I want to change the elements a[i: j] according to a function f. Can I do better than the naive way?

for index in range(i, j):
    a[index] = f(a)

[By better I mean something closer to map(f, a), or something faster.]

Answer 1

You can assign to the slice:

a[i:j] = map(f, a[i:j])