@property
def is_shipping_handling(self) -> bool:
    return ((self._item_name == self.ITEM_NAME_SHIPPING_HANDLING) and (self.price is None) and (self.number is None) and (self.subtotal_price_item is not None) and (self.total_order is None) and (self.credit_card_billing_date == '') and (self.credit_card_billing_amount == ''))
@property
def is_shipping_handling(self) -> bool:
    return ((self._item_name == self.ITEM_NAME_SHIPPING_HANDLING) and (self.price is None) and (self.number is None) and (self.subtotal_price_item is not None) and (self.total_order is None) and (self.credit_card_billing_date == ) and (self.credit_card_billing_amount == ))