code: def is_all_field_none(self):
          
  
          if self._id_ is not None:
              return False
  
          if self._created is not None:
              return False
  
          if self._updated is not None:
              return False
  
          if self._time_expiry is not None:
              return False
  
          if self._quote_id is not None:
              return False
  
          if self._amount_source is not None:
              return False
  
          if self._amount_target is not None:
              return False
  
          if self._amount_fee is not None:
              return False
  
          if self._rate is not None:
              return False
  
          if self._time_delivery_estimate is not None:
              return False
  
          return True
docs: :rtype: bool