Python list error step on slice with -1

0 votes

I believed I was familiar with the fundamentals of list slicing in Python, but I've been getting the following unexpected error while using a negative step on a slice:

>>> a = list(range(10))
>>> a
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> a[:-1]
[0, 1, 2, 3, 4, 5, 6, 7, 8]
>>> a[::-1]
[9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
>>> a[:-1:-1]
[]


Why does a[:-1:-1] not reverse step through the a[:-1] slice in the same way as it does with a[::-1] over the whole list?

I am aware that list.reverse() may also be used, but I'm attempting to better grasp how Python slices work.

Nov 17, 2022 in Python by Samuel
• 460 points
365 views

No answer to this question. Be the first to respond.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.

Related Questions In Python

0 votes
0 answers

Python list error: [::-1] step on [:-1] slice

I thought I understood the basics of ...READ MORE

Dec 20, 2022 in Python by erzan
• 630 points
158 views
0 votes
11 answers
0 votes
0 answers

I am trying to install PyBase64 on my python 3.8. But I end up with the following error:

$ pip install pybase ERROR: Could not find ...READ MORE

Mar 24, 2020 in Python by Nishant
• 210 points
2,573 views
0 votes
1 answer

I am trying to install os-win on my python 3.8. But I end up with the following error:

I have the same issue and is ...READ MORE

answered Sep 6, 2020 in Python by anonymous
7,056 views
0 votes
1 answer

I am trying to install visualize on my python 3.8 but i end up with the followinf error.

Hi@Avinash, I think the module name is visualization ...READ MORE

answered Apr 27, 2020 in Python by MD
• 95,440 points
1,357 views
0 votes
3 answers
0 votes
2 answers
+1 vote
2 answers

how can i count the items in a list?

Syntax :            list. count(value) Code: colors = ['red', 'green', ...READ MORE

answered Jul 7, 2019 in Python by Neha
• 330 points

edited Jul 8, 2019 by Kalgi 4,023 views
0 votes
1 answer
+5 votes
6 answers

Lowercase in Python

You can simply the built-in function in ...READ MORE

answered Apr 11, 2018 in Python by hemant
• 5,790 points
3,409 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP