For the WTF kind of operation, 'while' loops are much more idiomatic - generally, you'd want to use a for loop for things that are minimally recursive (i.e., wh

For the WTF kind of operation, 'while' loops are much more idiomatic - generally, you'd want to use a for loop for things that are minimally recursive (i.e., where you can see, before starting the loop, that the loop body will be executed N, or len(L), or whateverNumberItIs times).