Return to Revisions

3 of 3

Active reading [<https://en.wikipedia.org/wiki/%22Hello,_World!%22_program>].

edited Sep 26, 2019 at 8:23

reputation score 30959
22
22 gold badges
111
111 silver badges
134
134 bronze badges

I want to add one Hello, World! example that explains the basics of slices for the very beginners. It helped me a lot.

Let's have a list with six values ['P', 'Y', 'T', 'H', 'O', 'N']:

+---+---+---+---+---+---+
| P | Y | T | H | O | N |
+---+---+---+---+---+---+
  0   1   2   3   4   5

Now the simplest slices of that list are its sublists. The notation is [<index>:<index>] and the key is to read it like this:

[ start cutting before this index : end cutting before this index ]

Now if you make a slice [2:5] of the list above, this will happen:

        |           |
+---+---|---+---+---|---+
| P | Y | T | H | O | N |
+---+---|---+---+---|---+
  0   1 | 2   3   4 | 5

You made a cut before the element with index 2 and another cut before the element with index 5. So the result will be a slice between those two cuts, a list ['T', 'H', 'O'].

answered Apr 4, 2018 at 9:52

Jeyekomon

reputation score 3612
3
3 gold badges
34
34 silver badges
45
45 bronze badges

Collectives™ on Stack Overflow

Return to Revisions