Conway's game of Life, just because.
On Wed, May 8, 2019 at 4:31 AM Eli the Bearded <*@eli.users.panix.com> wrote:
> In comp.lang.python, Paul Rubin <no.email at nospam.invalid> wrote:
> Thanks for posting this. I'm learning python and am very familiar with
> this "game".
> > #!/usr/bin/python3
> > from itertools import chain
> > def adjacents(cell): # generate coordinates of cell neighbors
> > x, y = cell # a cell is just an x,y coordinate pair
> > return ((x+i,y+j) for i in [-1,0,1] for j in [-1,0,1] if i or j)
> This line confuses me. How do you expect "if i or j" to work there?
It means that if either i or j has a non-zero value, this will yield
something. With three possible values for i and three for j, it would
normally create nine results; but that condition means it will create
eight, skipping the (0, 0) option. Since the function is meant to give
you all the neighbors of a cell, it makes sense that it shouldn't
return the cell itself.