Python-сообщество

 all_blocks = [[] for i in range(int(max_x / s))]
for i in range(max_x):
    for j in range(max_y):
        block = Block(green, s, s)
        block.rect.x = i
        block.rect.y = j
        j += s
        all_blocks[count].append(block)
    i += s
    count += 1
    if count >= max_x / s:
        count = 0

 >>> import sys
>>> lst = [i for i in range(10000000)]
>>> sys.getsizeof(lst)
81528056
>>> 

 all_blocks = [[] for i in range(int(max_x/s))]
for i in range(int(max_x/s)):
    for j in range(int(max_y/s)):
        block = Block(green, s, s)
        block.rect.x = i * s
        block.rect.y = j * s
        j += 1
        all_blocks[i].append(block)
    i += 1