Hi Alan Thank you very much, I got it. So in this case, there is no need to specify where it ends.
In fact, even if I wanted to specify the ending, I can't! Thank you! On Sun, May 28, 2017 at 7:19 PM, Alan Gauld via Tutor <tutor@python.org> wrote: > On 28/05/17 18:58, C W wrote: > > > Now if I do case 2, > >> print(great[-3:-1]) > >> me > > > > Where did the exclamation mark go in case 2? > > > > I was told the count begins at zero, that's true going forward, but not > > backwards. > > Its not about where the count starts its about where it finishes. > It finishes 1 item before the second index. so in this case > you get the items at -3 and -2. > > If you specify a third parameter you can change the > direction of the count thus: > > >>> great[-1:-3:-1] > '!e' > > So now you get the characters at -1 and -2 (ie in reverse order) > > If you want them in original order starting at -3 just omit > the -1: > > >>> great[-3:] > 'me!' > > HTH, > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > http://www.amazon.com/author/alan_gauld > Follow my photo-blog on Flickr at: > http://www.flickr.com/photos/alangauldphotos > > > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
