On Aug 24, 9:17 am, "Carson Farmer" <[EMAIL PROTECTED]> wrote: > Dear list, > > I'm sure this is a relatively trivial problem, but I have been unable > to find any good examples/explanations on how to do this, so here > goes: > > I have multi-polygon object, which is simply a list of polygons, where > each polygon is a list of lines, where each line is a list of points. > What I would like to do, is change the x and y values of each point, > all the while keeping the structure of the lists intact. > > So in the end, the only thing that should be changed is the values, > not the lists themselves... clear as mud? > > Any hints, and/or suggestions are greatly appreciated, > > Carson
I think you would be looking at: seq3= [[[0,1],[1,2]],[[3,4]]] [ [ [ setitem( seq1, i0, seq0* 2 ) for i0, seq0 in enumerate( seq1 ) ] for seq1 in seq2 ] for seq2 in seq3 ] >>> seq3= [[[0,1],[1,2]],[[3,4]]] >>> [ [ [ setitem( seq1, i0, seq0* 2 ) for i0, seq0 in enumerate( seq1 ) ] for >>> seq1 in seq2 ] for seq2 in seq3 ] [[[None, None], [None, None]], [[None, None]]] >>> seq3 [[[0, 2], [2, 4]], [[6, 8]]] -- http://mail.python.org/mailman/listinfo/python-list