Scott Siegler <scott.sieg...@gmail.com> wrote:
> Hello,
>
> I am an experienced programmer but a beginner to python. As such, I
> can figure out a way to code most algorithms using more "C" style
> syntax.
>
> I am doing something now that I am sure is a more python way but i
> can't quite get it right. I was hoping someone might help.
>
> So I have a list of grid coordinates (x, y). From that list, I want
> to create a new list that for each coordinate, I add the coordinate
> just above and just below (x,y+1) and (x,y-1)
>
> right now I am using a for loop to go through all the coordinates and
> then separate append statements to add the top and bottom.
>
> is there a way to do something like: [(x,y-1), (x,y+1) for zzz in
> coord_list] or something along those lines?
>
> thanks!
>
def vertical_neighbours(coords):
for x, y in coords:
yield x, y-1
yield x, y+1
new_coords = list(vertical_neighbours(coords))
--
Duncan Booth http://kupuguy.blogspot.com
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