          assert_equal(dest.pop(), None)
  
          print('Test: 1 disk')
          src.push(5)
          hanoi(num_disks, src, dest, buff)
          assert_equal(dest.pop(), 5)
  
          print('Test: 2 or more disks')
          for i in range(num_disks, -1, -1):
              src.push(i)
 
</s> remove         for i in range(num_disks, -1, -1):
            src.push(i)
        hanoi(num_disks, src, dest, buff)
        for i in range(0, num_disks):
            assert_equal(dest.pop(), i)
 </s> add         for disk_index in range(num_disks, -1, -1):
            src.push(disk_index)
        hanoi.move_disks(num_disks, src, dest, buff)
        for disk_index in range(0, num_disks):
            assert_equal(dest.pop(), disk_index) </s> remove         hanoi(num_disks, src, dest, buff)
 </s> add         hanoi.move_disks(num_disks, src, dest, buff) </s> remove     "        hanoi(num_disks, src, dest, buff)\n",
 </s> add     "        hanoi.move_disks(num_disks, src, dest, buff)\n", </s> remove     "        hanoi(num_disks, src, dest, buff)\n",
 </s> add     "        hanoi.move_disks(num_disks, src, dest, buff)\n", </s> remove     "        for i in range(num_disks, -1, -1):\n",
    "            src.push(i)\n",
    "        hanoi(num_disks, src, dest, buff)\n",
    "        for i in range(0, num_disks):\n",
    "            assert_equal(dest.pop(), i)\n",
 </s> add     "        for disk_index in range(num_disks, -1, -1):\n",
    "            src.push(disk_index)\n",
    "        hanoi.move_disks(num_disks, src, dest, buff)\n",
    "        for disk_index in range(0, num_disks):\n",
    "            assert_equal(dest.pop(), disk_index)\n",
        hanoi.move_disks(num_disks, src, dest, buff)
          assert_equal(dest.pop(), None)
  
          print('Test: 1 disk')
          src.push(5)
        hanoi.move_disks(num_disks, src, dest, buff)
          assert_equal(dest.pop(), 5)
  
          print('Test: 2 or more disks')
          for i in range(num_disks, -1, -1):
              src.push(i)
keep keep keep keep replace keep keep keep keep keep
 Update hanoi challenge (#121)

Update constraints and test cases.  Move implementation to a class.  Update tests. 
recursion_dynamic/hanoi/test_hanoi.py