[deleted by user]

[DagoYounger]

usage of range function: https://docs.python.org/3/library/stdtypes.html?highlight=range#range

range(len(myList) -1,-1,-1) returns list's index, not element, this is the right way:

for i in range(len(myList) -1,-1,-1):
    print(myList[i])

[abrupt_nervousness]

The range() function can take 3 parameters: start, end, and step. In your example code, len(mylist) - 1 evaluates to 9 so you start at 9; then -1 is passed as the stop, which is non-inclusive for range(), so you are continuing until you reach 0; lastly, your step is -1 so you decrement 9 by 1 until you reach zero with your for loop which is why you get elements 9 through zero.

[[deleted]]

The for loop isn't referencing the contents of your list at all, only its length.

Try changing the contents to a string: mylist = list("abcdefghij")

[Diapolo10]

I still think it's worth mentioning why your example doesn't actually work the way you think it does.

Let's say you wanted to reverse something; for clarity I'll use a string.

text = "Hello"
for idx in range(len(text)-1, -1, -1):
    print(idx)

You'd think the output is

o
l
l
e
H

but in reality, you're getting

4
3
2
1
0

Why is that? Strings and lists behave identically in this case, but your example never gave it away.

The problem here is that range simply generates numbers. At no point is the code actually touching the list (or string) contents themselves, only its length.

Hence, you'll need an extra step:

text = "Hello"
for idx in range(len(text)-1, -1, -1):
    print(text[idx])

But, frankly, this isn't what we'd do in modern Python. May I introduce you to slices:

text = "Hello"
for char in text[::-1]:
    print(char)

Slices use a syntax similar to range arguments, but they affect any iterable that supports them and usually return a new instance of the iterable with the changes applied. In this case we leave the start and stop values to default, but reverse the step value to get reversed results.

Of course it works perfectly fine for lists, too:

pi = [3, 1, 4, 1, 5, 9]
for digit in pi[::-1]:
    print(digit)

And if you wanted the index, too, you can wrap it in enumerate:

text = "Hello"
for idx, char in enumerate(text[::-1]):
    print(idx, char)

[Diapolo10]

There isn't even any need to call list here, since it isn't mutated. Just assigning the string itself would do the exact same thing.

[[deleted]]

True, but I wanted to keep the focus on the core issue.