[Raymond] > > If it really is a sequence (with len and getitem), you can write your > > own indexing iterator: > > > def myslice(seq, start, stop, step): > > 'Allow forward or backwards iteration over a subslice' > > for i in range(start, stop, step): > > yield seq[i]
[StarWing] > Thank you. but it can't support negative index :-( The negative index is handled by the line, "yield seq[i]". >>> s[-2:-5:-1] == ''.join(myslice(s, -2, -5, -1)) True >>> s[-5:-2:1] == ''.join(myslice(s, -5, -2, 1)) True Raymond -- http://mail.python.org/mailman/listinfo/python-list
