def set_posting_list(self, posting_list: PostingList):
if not posting_list.closed:
raise RendererError("Cannot render an open posting list")
self.posting_list = posting_list
for shipping_label in posting_list.shipping_labels.values():
self.add_shipping_label(shipping_label)
def add_shipping_label(self, shipping_label: ShippingLabel):
if shipping_label in self.shipping_labels:
raise RendererError("Shipping Label {!s} already added".format(
shipping_label.tracking_code))
self.shipping_labels.append(shipping_label)