On 12/31/17 8:15 PM, Wu Xi wrote:
def neighbours(point):
x,y = point
yield x + 1 , y
yield x - 1 , y
yield x , y + 1
yield x , y - 1 # this is proof that life can emerge
inside of computers and cellular automatons,
yield x + 1 , y + 1 # and evolve through memory, attack other cells and morph into toads, pulsars, etc..
yield x + 1 , y - 1
yield x - 1 , y + 1 # spray your memory with space alien
patterns and life evolution will start in your machine !
yield x - 1 , y - 1
This code correctly yields eight new coordinates
'''
for i in range(-1, 2) :
for j in range(-1, 2) :
if i != j :
yield x + i, y + j
'''
This code only yields six of the eight needed.
# yield from [(x+i, x+j) for i in [-1,1] for j in [-1,1]]
This code only yields four!
Perhaps this is what you are looking for:
def neighbors(point):
x, y = point
for dx in [-1, 0, 1]:
for dy in [-1, 0, 1]:
if dx == dy == 0:
continue
yield x + dx, y + dy
--Ned.
--
https://mail.python.org/mailman/listinfo/python-list
