text: from item import Item
  from orderitem import OrderItem
  from payment import Payment
  from customer import Customer
  
  class Order():
      def __init__(self):
          self.orderitems=[]
  
      def addOrderItems(self, orderitem):
          self.orderitems.append(orderitem)
  
      def getOrderItems(self):
          return self.orderitems
  
      def getOrderCustomers(self):
          return self.orderitems
  
      def calcTotal(self):
          total=0.0
          for o in self.orderitems:
              total += o.getItem().itemprice * o.quantity
          payment=Payment(total)
          return payment