old_contents: class TransperthException(Exception):
      """
      Base exception for all exceptions thrown by this library
      """
  
  
  class InvalidStopNumber(TransperthException):
      """
      Thrown when the provided stop number is not a five digit number
      """
  
  
  class InvalidDirection(TransperthException):
      """
      Thrown when the provided direction is neither to nor from
      """
  
  
  class InvalidStep(TransperthException):
      """
      Thrown when a step is not one of 'bus', 'walk', 'train'
      """
  
  
  class NoFareData(TransperthException):
      """
      Thrown when transperth does not provide data from which we
      can assertain the fare for a route
      """
  
new_contents: class TransperthException(Exception):
      """
      Base exception for all exceptions thrown by this library
      """
  
  
  class InvalidStopNumber(TransperthException):
      """
      Thrown when the provided stop number is not a five digit number
      """
  
  
  class InvalidDirection(TransperthException):
      """
      Thrown when the provided direction is neither to nor from
      """
  
  
  class InvalidStep(TransperthException):
      """
      Thrown when a step is not one of 'bus', 'walk', or 'train'
      """
  
  
  class NoFareData(TransperthException):
      """
      Thrown when transperth does not provide data from which we
      can assertain the fare for a route
      """
  
subject: Mend grammar