old_contents: #!/usr/bin/python
  #
  # Copyright 2014 Google Inc.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  ################################################################################
  #
  # Demonstration of catching an exception and verifying its fields.
  #
  ################################################################################
  
  import unittest
  
  
  class MyException(Exception):
      def __init__(self, message):
          self.message = message
  
  
  def RaiseException(message):
      raise MyException(message)
  
  
  class ExceptionTest(unittest.TestCase):
      def verifyComplexException(self, exception_class, message, callable, *args):
          with self.assertRaises(exception_class) as cm:
              callable(*args)
  
          exception = cm.exception
          self.assertEqual(exception.message, message)
  
      def testRaises(self):
          self.verifyComplexException(MyException, 'asdf', RaiseException, 'asdf')
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: #!/usr/bin/python
  #
  # Copyright 2014 Google Inc.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Demonstration of catching an exception and verifying its fields."""
  
  import unittest
  
  
  class MyException(Exception):
      def __init__(self, message):
          self.message = message
  
  
  def RaiseException(message):
      raise MyException(message)
  
  
  class ExceptionTest(unittest.TestCase):
      def verifyComplexException(self, exception_class, message, callable, *args):
          with self.assertRaises(exception_class) as cm:
              callable(*args)
  
          exception = cm.exception
          self.assertEqual(exception.message, message)
  
      def testRaises(self):
          self.verifyComplexException(MyException, 'asdf', RaiseException, 'asdf')
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Convert top-level-comment to a docstring.