"Larry Martell" <larry.mart...@gmail.com> wrote in message news:CACwCsY5P47-dB1NLQTUTQ=0aF6B+-M3y4hCxcUGmcVmHM8=-x...@mail.gmail.com... >I think I know the answer is no, but is there any package that allows > creating a list with holes in it? E.g. I'd want to do something like: > > x[10] = 12 > x[20] = 30 > > I'm thinking of something like defaultdict but for lists (I know > that's very different, but ... ) > > Thanks! > -larry
Just out of interest, I asked the same question on this list many years ago, and someone actually gave me an answer. It was something like the following - >>> class MyList(list): ... def __getitem__(self, pos): ... try: ... return list.__getitem__(self, pos) ... except IndexError: ... return None ... def __setitem__(self, pos, value): ... try: ... list.__setitem__(self, pos, value) ... except IndexError: ... diff = pos - list.__len__(self) ... self.extend([None] * diff) ... self.append(value) ... >>> ml = MyList() >>> ml[3] >>> ml[3] = 'a' >>> ml [None, None, None, 'a'] >>> I wanted it because I was familiar with it from a previous language I had used. As is turns out, I never actually used it, but I was impressed! Frank Millman -- https://mail.python.org/mailman/listinfo/python-list
