On Thu, Mar 3, 2016 at 6:08 PM, John Gordon <gor...@panix.com> wrote:
> In <8b3d06eb-0027-4396-bdf8-fee0cc9ff...@googlegroups.com> > vlyamt...@gmail.com writes: > > > i have list of strings "data" and i am trying to build reverse list data1 > > data1 = [] > > for i in range(len(data)): > > j = len(data) - i > > data1.append(data[j]) > > > but i have the following error: > > data1.append(data[j]) > > IndexError: list index out of range > > > > am i doing it wrong? > > Thanks > > Python lists are zero-indexed, meaning a list of five items will have > indexes 0 to 4. > > The first time through your loop, i is 0, so > > j = len(data) - i > > evaluates to > > j = len(data) > > which would yield 5 for a five-element list, but the last actual element > is in data[4]. > >>> s = "123" >>> s2 = s[::-1] >>> s2 '321' >>> Use reverse slice > > -- > John Gordon A is for Amy, who fell down the stairs > gor...@panix.com B is for Basil, assaulted by bears > -- Edward Gorey, "The Gashlycrumb Tinies" > > -- > https://mail.python.org/mailman/listinfo/python-list > -- Joel Goldstick http://joelgoldstick.com/ <http://joelgoldstick.com/stats/birthdays> http://cc-baseballstats.info/ -- https://mail.python.org/mailman/listinfo/python-list
