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