old_contents: import json
  
  class MailosaurError:
      """MailosaurError.
  
      :param type: Possible values include: 'None', 'ValidationError',
       'AuthenticationError', 'PermissionDeniedError', 'ResourceNotFoundError'
      :type type: str or ~mailosaur.models.enum
      :param messages:
      :type messages: dict[str, str]
      :param model:
      :type model: object
      """
  
      def __init__(self, data):
          self.type = data.get('type', None)
          self.messages = data.get('messages', None)
          self.model = data.get('model', None)
  
  
  class MailosaurException(Exception):
      """Server responsed with exception of type: 'MailosaurError'.
      """
  
      def __init__(self, response):
          message = "Operation returned an invalid status code '%s'" % (response.reason)
          super(MailosaurException, self).__init__(message)
  
          if response.status_code in [400]:
              data = json.loads(response._content)
              self.error = MailosaurError(data)
  
new_contents: import json
  
  class MailosaurError:
      """MailosaurError.
  
      :param type: Possible values include: 'None', 'ValidationError',
       'AuthenticationError', 'PermissionDeniedError', 'ResourceNotFoundError'
      :type type: str or ~mailosaur.models.enum
      :param messages:
      :type messages: dict[str, str]
      :param model:
      :type model: object
      """
  
      def __init__(self, data):
          self.type = data.get('type', None)
          self.messages = data.get('messages', None)
          self.model = data.get('model', None)
  
  
  class MailosaurException(Exception):
      """Server responsed with exception of type: 'MailosaurError'.
      """
  
      def __init__(self, response):
          message = "Operation returned an invalid status code '%s'" % (response.reason)
          super(MailosaurException, self).__init__(message)
          self.message = message
  
          if response.status_code in [400]:
              data = json.loads(response._content)
              self.error = MailosaurError(data)
  
subject: Set message