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?
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.
The 0-1 is -1, it can be written either way:
>>> -1
-1
>>> 0-1
-1
Let's try a string length of 10, stop of 0-1 ad step of -1:
>>> range(10, 0-1, -1)
[10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
you'll see the same result with -1 instead of 0-1:
>>> range(10, -1, -1)
[10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
The step of -1 causes range to count backward, let's try a step of 1:
>>> range(10, 0-1, 1)
[]
When in doubt, shell it out
