When slicing: l[start:end:step] In your example of "a[2::-1]" you are reversing the list by using a step of -1, then you are slicing at index 2 (third element).
*Matt Jones* On Tue, Apr 16, 2013 at 10:30 AM, Chris Angelico <ros...@gmail.com> wrote: > On Wed, Apr 17, 2013 at 1:20 AM, <idkfaidkfaid...@gmail.com> wrote: > > Hi all, > > i'm programming in python for the first time (usually i use C as > programming language). I don't understand these results: > > > >>>> a=[1,2,3,4,5] > >>>> a[:-1] > > [1, 2, 3, 4] > >>>> a[::-1] > > [5, 4, 3, 2, 1] > >>>> a[2::-1] > > [3, 2, 1] > > > > what does a[2::-1] means? > > That's taking a slice. This page has something to say on the subject: > > http://docs.python.org/3.3/tutorial/introduction.html > > By the way, regarding your email address: there are no cheat codes in > Python... either that, or Python *is* a cheat code. :) > > ChrisA > [[ VERY HAPPY CODING ADDED ]] > -- > http://mail.python.org/mailman/listinfo/python-list >
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