# Ruby
a = []
3.times{|x| 3.times{|y| a << [x,y] if x != y }}

# Python
a = []
for x in range(3):
    for y in range(3):
        if x != y:
            a += [(x,y)]

Both produce [[0, 1], [0, 2], [1, 0], [1, 2], [2, 0], [2, 1]]