Conformed to PEP-8.

functional_tests.py

 from selenium import webdriver
 import unittest
 
-from selenium import webdriver
-
 
 class NewVisitorTest(unittest.TestCase):
+
     def setUp(self):
         self.browser = webdriver.Firefox()
 

heroes/tests.py

 from django.test import TestCase
 
 class HomePageTest(TestCase):
+
     def test_heroes_page_returns_correct_html(self):
         response = self.client.get('/heroes/')
         self.assertTemplateUsed(response, 'heroes.html')