On Thu, Apr 18, 2013 at 11:58 PM, inshu chauhan <insidesh...@gmail.com> wrote: > segments.setdefault(reg_num, [])[point] += point
Not sure what your desired structure is. This is seeking to add the point to something indexed by the point; perhaps you simply want to append to the list itself? segments.setdefault(reg_num, []).append(point) ChrisA -- http://mail.python.org/mailman/listinfo/python-list
