      "# %load test_radix_sort.py\n",
      "from nose.tools import assert_equal, assert_raises\n",
      "\n",
      "\n",
      "class TestRadixSort(object):\n",
      "\n",
      "    def test_sort(self):\n",
      "        radix_sort = RadixSort()\n",
      "        assert_raises(TypeError, radix_sort.sort, None)\n",
      "        assert_equal(radix_sort.sort([]), [])\n",
 
</s> remove     "class TestRadixSort(object):\n",
 </s> add     "class TestRadixSort(unittest.TestCase):\n", </s> remove     "from nose.tools import assert_equal, assert_raises\n",
 </s> add     "import unittest\n", </s> remove     "        assert_raises(TypeError, radix_sort.sort, None)\n",
    "        assert_equal(radix_sort.sort([]), [])\n",
 </s> add     "        self.assertRaises(TypeError, radix_sort.sort, None)\n",
    "        self.assertEqual(radix_sort.sort([]), [])\n", </s> remove     "        assert_raises(TypeError, radix_sort.sort, None)\n",
    "        assert_equal(radix_sort.sort([]), [])\n",
 </s> add     "        self.assertRaises(TypeError, radix_sort.sort, None)\n",
    "        self.assertEqual(radix_sort.sort([]), [])\n", </s> remove     "from nose.tools import assert_equal, assert_raises\n",
 </s> add     "import unittest\n",
    "class TestRadixSort(unittest.TestCase):\n",
      "# %load test_radix_sort.py\n",
      "from nose.tools import assert_equal, assert_raises\n",
      "\n",
      "\n",
    "class TestRadixSort(unittest.TestCase):\n",
      "\n",
      "    def test_sort(self):\n",
      "        radix_sort = RadixSort()\n",
      "        assert_raises(TypeError, radix_sort.sort, None)\n",
      "        assert_equal(radix_sort.sort([]), [])\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for sorting_searching/ (#278) 
sorting_searching/radix_sort/radix_sort_challenge.ipynb