weird_list_comp.py

[unique_partners.update([supplier.name for supplier in supplier_info]) for supplier_info in [line.product_id.seller_ids for line in self.order_lines if line.product_id and line.product_id.seller_ids]]

# This small snippet does the exact same task as the following:

for line in self.order_lines:
            if line.product_id and line.product_id.seller_ids:
                for supplier_info in line.product_id.seller_ids:
                    unique_partners.update([supplier.name for supplier in supplier_info])