On 5/24/2012 4:53 PM, Duncan Booth wrote:
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.
Hi, welcome to Python. I came here from C also.
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)
The Python way, especially the Python 3 way, is to not make the new
sequence into a concrete list unless you actually need a list to append
or sort or otherwise mutate. In many use cases, that is not necessary.
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?
def vertical_neighbours(coords):
for x, y in coords:
yield x, y-1
yield x, y+1
new_coords = list(vertical_neighbours(coords))
--
Terry Jan Reedy
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