Explanation of ::-1 in lists

Question

I can reverse list order by using the reversed iterator or by using ::-1, as shown in this code:

li=[1,2,3]

print(list(reversed(li)))
print(li[::-1])

However, I have not understodde the meaning of the :: addressing, and I have not found any documentation on this feature (possible due to the fact that searching for :: creates problems).

Can anyone help? Thank you.

The good old alien smiley slice. – Blckknght Apr 25 '21 at 07:21 — Blckknght, Apr 25 '21 at 07:21

score 1 · Accepted Answer · answered Apr 25 '21 at 06:10

1

That's an example of slicing. In Python, it's done like list[start:stop:step].Take a look at this SO answer for more details. In particular, note that the -1 is the step, meaning that it reverses how the list is traversed.

answered Apr 25 '21 at 06:10

jss367

4,759
14
54
76

Explanation of ::-1 in lists

1 Answers1