On Sun, Aug 8, 2010 at 12:04 PM, Daniel <asmosis.aste...@gmail.com> wrote: > Hello everyone! I would like to ask you two questions regarding strings > which I do not know. Excuse me in advance if the questions may seem a bit > dumb. I'm a beginner. So let's get back to the point, this is my string: > > msg= 'Hello world' > If I do, msg[:3] I get the following output, 'Hel' > If I do, msg[6:] I get the following output, 'World' > Ok, so I understand why this is happening. What I do not understand is why I > get the following output in this cases. > > > 1) msg[:-1] which has the output 'Hello Worl'
negative indexes start from the end of the string. So msg[-1] == 'd', and the slice there means "start at the first character, and go up to the last. > 2) msg[0:6:2] 'Hlo' This means start at the first, up to the sixth, making steps of 2. Steps of two means every other letter is skipped, of course. > 3) msg[::-1] 'dlroW olleH' This slice catches the whole string, but makes steps of -1, which essentially means you'll go through the strings backwards. Hugo _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
