      "class TestPriorityQueue(object):\n",
      "\n",
      "    def test_priority_queue(self):\n",
      "        priority_queue = PriorityQueue()\n",
      "        assert_equal(priority_queue.extract_min(), None)\n",
      "        priority_queue.insert(PriorityQueueNode('a', 20))\n",
      "        priority_queue.insert(PriorityQueueNode('b', 5))\n",
      "        priority_queue.insert(PriorityQueueNode('c', 15))\n",
      "        priority_queue.insert(PriorityQueueNode('d', 22))\n",
      "        priority_queue.insert(PriorityQueueNode('e', 40))\n",
 
</s>
    "        self.assertEqual(priority_queue.extract_min(), None)\n",
      "class TestPriorityQueue(object):\n",
      "\n",
      "    def test_priority_queue(self):\n",
      "        priority_queue = PriorityQueue()\n",
    "        self.assertEqual(priority_queue.extract_min(), None)\n",
      "        priority_queue.insert(PriorityQueueNode('a', 20))\n",
      "        priority_queue.insert(PriorityQueueNode('b', 5))\n",
      "        priority_queue.insert(PriorityQueueNode('c', 15))\n",
      "        priority_queue.insert(PriorityQueueNode('d', 22))\n",
      "        priority_queue.insert(PriorityQueueNode('e', 40))\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for arrays_strings/ (#274)
arrays_strings/priority_queue/priority_queue_solution.ipynb