      "        stacks.push(1, 3)\n",
      "        stacks.push(2, 4)\n",
      "\n",
      "        print('Test: Pop on non-empty stack')\n",
      "        assert_equal(stacks.pop(0), 2)\n",
      "        assert_equal(stacks.pop(0), 1)\n",
      "        assert_equal(stacks.pop(1), 3)\n",
      "        assert_equal(stacks.pop(2), 4)\n",
      "\n",
      "        print('Success: test_stacks\\n')\n",
      "\n",
      "\n",
      "def main():\n",
 
</s> remove     "        assert_equal(stacks.pop(0), 2)\n",
    "        assert_equal(stacks.pop(0), 1)\n",
    "        assert_equal(stacks.pop(1), 3)\n",
    "        assert_equal(stacks.pop(2), 4)\n",
 </s> add     "        self.assertEqual(stacks.pop(0), 2)\n",
    "        self.assertEqual(stacks.pop(0), 1)\n",
    "        self.assertEqual(stacks.pop(1), 3)\n",
    "        self.assertEqual(stacks.pop(2), 4)\n", </s> remove         assert_equal(stacks.pop(0), 2)
        assert_equal(stacks.pop(0), 1)
        assert_equal(stacks.pop(1), 3)
        assert_equal(stacks.pop(2), 4)
 </s> add         self.assertEqual(stacks.pop(0), 2)
        self.assertEqual(stacks.pop(0), 1)
        self.assertEqual(stacks.pop(1), 3)
        self.assertEqual(stacks.pop(2), 4) </s> remove     "        assert_equal(queue.dequeue(), 2)\n",
    "        assert_equal(queue.dequeue(), 3)\n",
    "        assert_equal(queue.dequeue(), 4)\n",
 </s> add     "        self.assertEqual(queue.dequeue(), 2)\n",
    "        self.assertEqual(queue.dequeue(), 3)\n",
    "        self.assertEqual(queue.dequeue(), 4)\n", </s> remove     "        assert_equal(queue.dequeue(), 2)\n",
    "        assert_equal(queue.dequeue(), 3)\n",
    "        assert_equal(queue.dequeue(), 4)\n",
 </s> add     "        self.assertEqual(queue.dequeue(), 2)\n",
    "        self.assertEqual(queue.dequeue(), 3)\n",
    "        self.assertEqual(queue.dequeue(), 4)\n", </s> remove     "        assert_equal(stack.pop(), 3)\n",
    "        assert_equal(stack.peek(), 2)\n",
    "        assert_equal(stack.pop(), 2)\n",
    "        assert_equal(stack.peek(), 1)\n",
    "        assert_equal(stack.is_empty(), False)\n",
    "        assert_equal(stack.pop(), 1)\n",
    "        assert_equal(stack.peek(), None)\n",
    "        assert_equal(stack.is_empty(), True)\n",
 </s> add     "        self.assertEqual(stack.pop(), 3)\n",
    "        self.assertEqual(stack.peek(), 2)\n",
    "        self.assertEqual(stack.pop(), 2)\n",
    "        self.assertEqual(stack.peek(), 1)\n",
    "        self.assertEqual(stack.is_empty(), False)\n",
    "        self.assertEqual(stack.pop(), 1)\n",
    "        self.assertEqual(stack.peek(), None)\n",
    "        self.assertEqual(stack.is_empty(), True)\n",
    "        self.assertEqual(stacks.pop(0), 2)\n",
    "        self.assertEqual(stacks.pop(0), 1)\n",
    "        self.assertEqual(stacks.pop(1), 3)\n",
    "        self.assertEqual(stacks.pop(2), 4)\n",
      "        stacks.push(1, 3)\n",
      "        stacks.push(2, 4)\n",
      "\n",
      "        print('Test: Pop on non-empty stack')\n",
    "        self.assertEqual(stacks.pop(0), 2)\n",
    "        self.assertEqual(stacks.pop(0), 1)\n",
    "        self.assertEqual(stacks.pop(1), 3)\n",
    "        self.assertEqual(stacks.pop(2), 4)\n",
    "        self.assertEqual(stacks.pop(0), 2)\n",
    "        self.assertEqual(stacks.pop(0), 1)\n",
    "        self.assertEqual(stacks.pop(1), 3)\n",
    "        self.assertEqual(stacks.pop(2), 4)\n",
    "        self.assertEqual(stacks.pop(0), 2)\n",
    "        self.assertEqual(stacks.pop(0), 1)\n",
    "        self.assertEqual(stacks.pop(1), 3)\n",
    "        self.assertEqual(stacks.pop(2), 4)\n",
    "        self.assertEqual(stacks.pop(0), 2)\n",
    "        self.assertEqual(stacks.pop(0), 1)\n",
    "        self.assertEqual(stacks.pop(1), 3)\n",
    "        self.assertEqual(stacks.pop(2), 4)\n",
      "\n",
      "        print('Success: test_stacks\\n')\n",
      "\n",
      "\n",
      "def main():\n",
keep keep keep keep replace replace replace replace keep keep keep keep keep
 #273: Remove nose dependency for stacks_queues/ (#276) 
stacks_queues/n_stacks/n_stacks_challenge.ipynb