Help doing it the "python way"

[Duncan Booth]

Scott Siegler <scott.siegler at 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