不确定如何解决此“内存错误”

Question

每当我运行我的代码时，我当前都会获得内存。这是导致问题的代码部分。行clear_nodes.append（i +（grid_size * 4））是给出内存错误的那一行，我不确定如何消除它。谢谢

blocked_rows = []
for num in range(grid_size, 2*grid_size):
    blocked_rows.append(num)
    blocked_rows.append(num+(grid_size*2))
    blocked_rows.append(num+2*(grid_size*2))
    blocked_rows.append(num+3*(grid_size*2))
    blocked_rows.append(num+4*(grid_size*2))
    blocked_rows.sort()
    clear_nodes = []
    for i in blocked_rows:
        if i == (grid_size*2)-1:
            clear_nodes.append(i)
        if i == (grid_size*3):
            clear_nodes.append(i)
        for i in clear_nodes:
            clear_nodes.append(i+(grid_size*4))
            #clear_nodes.append(i+(grid_size*8))
        for i in clear_nodes:
            if i < (grid_size * grid_size):
                all_blocked.append(i)