code: def _prepare_wsdl_objects(self):
          
          self.CarrierCode = 'FDXE'
          self.Origin = self.client.factory.create('Address')
          self.Destination = self.client.factory.create('Address')
          self.ShipDate = datetime.date.today().isoformat()
          self.Service = None
          self.Packaging = 'YOUR_PACKAGING'
docs: Create the data structure and get it ready for the WSDL request.