How does Python execute string slicing?

Question

Is there any kind of algorithm that you can apply to understand how Python will slice and output a sting?

I have

a="what's up"

And let's say I slice it like this:

print(a[-2:-9:-1])

So it gives me "u s'tah"

But what exactly does Python do first and last when slicing a string? Like, does it reverse a string first and then slice it, etc.?

All your questions (including the one you deleted just now) seem to be variations of the same theme. Perhaps retreat to reading existing materials until you have a _specific,_ _concrete_ question about this. — tripleee, Apr 23 '22 at 16:15
Does this answer your question? [Understanding slicing](https://stackoverflow.com/questions/509211/understanding-slicing) — jonrsharpe, Apr 23 '22 at 16:16
@tripleee Yes, they are. I'm just bad at putting all my requests into one precise, well-organized question. [This](https://stackoverflow.com/questions/5798136/python-reverse-stride-slicing?noredirect=1&lq=1) one is the closest to what I try to understand. But it seems I just don't understand the topic completely, or I'm extremely confused. — imstuckwithsumfindumbsoplshelp, Apr 23 '22 at 17:49

score 2 · Accepted Answer · edited Apr 23 '22 at 18:01

a="what's up"
print(a[-2:-9:-1]) - a[(start, end , step)]

So, the output would be "u s'tah"

  print(a[-2:-9:-1]) # u s'tah
    print(a[-2:-9:-2]) # usth
    print(a[-2:-9:-3]) # u'h

1 Answers1