old_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <tsuyoshi.hombashi@gmail.com>
  """
  
  from __future__ import absolute_import
  
  
  class NetworkInterfaceNotFoundError(Exception):
      """
      Exception raised when network interface not found.
      """
  
  
  class ModuleNotFoundError(Exception):
      """
      Exception raised when mandatory kernel module not found.
      """
  
  
  class TcCommandExecutionError(Exception):
      """
      Exception raised when failed to execute a ``tc`` command.
      """
  
  
  class TcAlreadyExist(TcCommandExecutionError):
      """
      Exception raised when a traffic shaping rule already exist.
      """
  
  
  class EmptyParameterError(ValueError):
      """
      Exception raised when a parameter value is empty value.
      """
  
  
  class InvalidParameterError(ValueError):
      """
      Exception raised when an invalid parameter specified for
      a traffic shaping rule.
      """
  
      def __init__(self, *args, **kwargs):
          self.__value = kwargs.pop("value", None)
          self.__expected = kwargs.pop("expected", None)
  
          super(ValueError, self).__init__(*args)
  
      def __str__(self, *args, **kwargs):
          item_list = [ValueError.__str__(self, *args, **kwargs)]
          extra_item_list = []
  
          if self.__expected:
              extra_item_list.append("expected={}".format(self.__expected))
  
          if self.__value:
              extra_item_list.append("value={}".format(self.__value))
  
          if extra_item_list:
              item_list.extend([":", ", ".join(extra_item_list)])
  
          return " ".join(item_list)
  
      def __repr__(self, *args, **kwargs):
          return self.__str__(*args, **kwargs)
  
  
  class UnitNotFoundError(InvalidParameterError):
      """
      """
  
new_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <tsuyoshi.hombashi@gmail.com>
  """
  
  from __future__ import absolute_import
  
  
  class NetworkInterfaceNotFoundError(Exception):
      """
      Exception raised when network interface not found.
      """
  
  
  class ModuleNotFoundError(Exception):
      """
      Exception raised when mandatory kernel module not found.
      """
  
  
  class TcCommandExecutionError(Exception):
      """
      Exception raised when failed to execute a ``tc`` command.
      """
  
  
  class TcAlreadyExist(TcCommandExecutionError):
      """
      Exception raised when a traffic shaping rule already exist.
      """
  
  
  class EmptyParameterError(ValueError):
      """
      Exception raised when a parameter value is empty value.
      """
  
  
  class InvalidParameterError(ValueError):
      """
      Exception raised when an invalid parameter specified for
      a traffic shaping rule.
      """
  
      def __init__(self, *args, **kwargs):
          self.__value = kwargs.pop("value", None)
          self.__expected = kwargs.pop("expected", None)
  
          super(InvalidParameterError, self).__init__(*args, **kwargs)
  
      def __str__(self, *args, **kwargs):
          item_list = [ValueError.__str__(self, *args, **kwargs)]
          extra_item_list = []
  
          if self.__expected:
              extra_item_list.append("expected={}".format(self.__expected))
  
          if self.__value:
              extra_item_list.append("value={}".format(self.__value))
  
          if extra_item_list:
              item_list.extend([":", ", ".join(extra_item_list)])
  
          return " ".join(item_list)
  
      def __repr__(self, *args, **kwargs):
          return self.__str__(*args, **kwargs)
  
  
  class UnitNotFoundError(InvalidParameterError):
      """
      """
  
subject: Modify constructor call for the superclass