old_contents: __author__ = "Ian Goodfellow"
  """
  Exceptions used by basic support utilities.
  """
  
  class EnvironmentVariableError(Exception):
      """ An exception raised when a required environment variable is not defined """
  
      def __init__(self, *args):
          super(EnvironmentVariableError,self).__init__(*args)
  
new_contents: __author__ = "Ian Goodfellow"
  """
  Exceptions used by basic support utilities.
  """
  
  class EnvironmentVariableError(Exception):
      """
      An exception raised when a required environment variable is not defined
      """
  
      def __init__(self, *args):
          super(EnvironmentVariableError,self).__init__(*args)
  
subject: Format docstrings in utils/exc.py