      "# %load test_trie.py\n",
      "from nose.tools import assert_true\n",
      "\n",
      "\n",
      "class TestTrie(object):\n",
      "\n",
      "    def test_trie(self):\n",
      "        print('Test: Remove from empty trie')\n",
      "        trie = Trie()\n",
      "        assert_true(trie.remove('foo') is None)\n",
 
</s> remove     "        print('Test: Remove from empty trie')\n",
 </s> add  </s> remove     "    @raises(Exception)\n",
 </s> add  </s> remove     "        assert_true(trie.remove('foo') is None)\n",
 </s> add  </s> remove     "from nose.tools import assert_true\n",
 </s> add     "import unittest\n", </s> remove     "        assert_true(trie.remove('foo') is None) \n",
 </s> add     "        self.assertTrue(trie.remove('foo') is None) \n",
    "class TestTrie(unittest.TestCase):       \n",
      "# %load test_trie.py\n",
      "from nose.tools import assert_true\n",
      "\n",
      "\n",
    "class TestTrie(unittest.TestCase):       \n",
      "\n",
      "    def test_trie(self):\n",
      "        print('Test: Remove from empty trie')\n",
      "        trie = Trie()\n",
      "        assert_true(trie.remove('foo') is None)\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/trie/trie_challenge.ipynb