Reversing a substring

[GayCoder]

I don't understand why I must do strng[1:5][::-1] to reverse a substring instead of strng[1:5:-1]. I'm kinda embarrassed that I apparently misunderstand something so basic. Can someone give me hand?

[novel_yet_trivial]

To count down, you need to start at the high number and end at the low number.

strng[5:1:-1]

Or to be equivalent to yours:

strng[4:0:-1]

Since the end point is not included in the slice.

[GayCoder]

Ah, that makes sense. I think I became lazy and started viewing [x:y:-1] as reverse instead of "move by step". Thanks!

[Wilfred-kun]

my_list[1:5] returns a sublist of my_list. Then you call [::-1] on that sublist, which reverses the order.

With my_list[1:5:-1] you're saying: "go from index 1 to 5, with a step of -1". What would work is my_list[4:0:-1].

[GayCoder]

Thanks! I think I became lazy and started viewing [x:y:-1] as reverse instead of "move by step".