Question

I found this previously answered here, Best way to loop over a python string backwards

I need to use OP’s original idea, but I don’t quite understand the meaning of the stop argument in the range function. What does 0-1 mean? From 0-1? Wouldn’t that be the step?

Answer 1

Why can’t you use reversed as accepted in the previously answered question?

However, to answer your original question:

The 0-1 is actually just a number 0-1, which is equal to -1

The documentation for range says the following: range(start[, end[, step]]). His call looks like the following: range(len(string)-1, 0-1, -1)

start = len(string)-1, which is last letter of the string.

end = 0-1 which is equal to -1, so the last letter being handled is 0. Remember that range(0, 3) will actually give 0, 1, 2 and stop right before the 3. Same goes for negative numbers, it will stop right before -1, so it will stop at 0.

step = -1. Step stands for how many numbers to step over at once. -1 means it will lower i by one every time.