old_contents: import unittest
  import sys
  import os
  
  sys.path.insert(0, os.path.dirname(__file__))
  
  if __name__ == "__main__":
  #    all_tests = unittest.TestLoader().discover('./tests')
  #    unittest.TextTestRunner().run(all_tests)
       return True
  
new_contents: # import unittest
  import sys
  import os
  
  sys.path.insert(0, os.path.dirname(__file__))
  
  if __name__ == "__main__":
      # all_tests = unittest.TestLoader().discover('./tests')
      # unittest.TextTestRunner().run(all_tests)
      None
  
subject: fix pep8 errors