      "from nose.tools import assert_true\n",
      "from nose.tools import raises\n",
      "\n",
      "\n",
      "class TestTrie(object):       \n",
      "\n",
      "    def test_trie(self):\n",
      "        trie = Trie()\n",
      "\n",
      "        print('Test: Insert')\n",
 
</s> remove     "from nose.tools import assert_true\n",
    "from nose.tools import raises\n",
 </s> add     "import unittest\n", </s> remove     "class TestTrie(object):\n",
 </s> add     "class TestTrie(unittest.TestCase):       \n", </s> remove     "        print('Test: Remove from empty trie')\n",
 </s> add  </s> remove class TestTrie(object):       
 </s> add class TestTrie(unittest.TestCase):        </s> remove     "        assert_true(trie.remove('foo') is None)\n",
 </s> add 
    "class TestTrie(unittest.TestCase):       \n",
      "from nose.tools import assert_true\n",
      "from nose.tools import raises\n",
      "\n",
      "\n",
    "class TestTrie(unittest.TestCase):       \n",
      "\n",
      "    def test_trie(self):\n",
      "        trie = Trie()\n",
      "\n",
      "        print('Test: Insert')\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