如何为每个客户创建字典队列？

Question

我是 python 的初学者。我们有一个任务要求我们创建一个字典队列。我不确定如何在列表中执行此操作。这是我的代码（顺便说一句，这是播放代码，未在功能上使用）我的主要目标是更好地理解这一点。代码：

class Queue:
    def __init__(self):
        self.items = []
        
    def size(self):
        return len(self.items)

    def enqueue(self, item):
        self.items.append(item)

    def dequeue(self):
        if self.size() == 0:
            return None
        return self.items.pop(0)

    def show_queue(self):
        print(self.items)  


# CODE CHALLENGE
class IceCreamShop:
    order = {
        "customer" : "",
        "flavor" : "",
        "scoops" : "",
    }
    def __init__(self, flavors):
        self.flavors = flavors
        order = Queue()
        
        
    def take_order(self, customer, flavor, scoops):
        if flavor in self.flavors and scoops in range(1, 4):
            for orders in self.order:
                self.order["customer"] = customer
                self.order["flavor"] = flavor
                self.order["scoops"] = scoops
                print("Order Created!")
                print(self.order)
                return self.order         
        else:
            print("Sorry, we don't have that flavor.\n Pick another flavor or less scoops.")
            
            
    def show_all_orders(self):
        for orders in self.order.values():
            print(self.order)
            
    def next_order(self):
        # show next order in queue
        print("Next Order...")
           
            
shop = IceCreamShop(["rocky road", "mint chip", "pistachio"])
shop.take_order("Zachary", "pistachio", 3)
shop.take_order("Marcy", "mint chip", 1)
shop.take_order("Leopold", "vanilla", 2)
shop.take_order("Bruce", "rocky road", 0)
shop.show_all_orders()
shop.next_order()
shop.show_all_orders()

我不明白的是，

1. 如何为队列中的每个客户保存字典？
2. 我将如何为每个客户“出列”和“入列”字典
3. 在“take_orders”函数中，它确实返回了 2 个不同的客户，Zach 和 Marcy
4. 但是在“show_all_orders”函数中，它只打印出 Marcy？为什么是这样？

Answer 1

1. 让我们在 IceCreamShop 类的 __init__ 中创建队列来存储订单

   self.orders = Queue()
   

2. 您不需要在 IceCreamShop 类中有一个 order 空白模板。因为你可以在函数take_order中创建局部变量order，然后将这个order添加到队列self.orders

   def take_order(self, customer, flavor, scoops):
       if flavor in self.flavors and scoops in range(1, 4):
           order = dict()
           order["customer"] = customer
           order["flavor"] = flavor
           order["scoops"] = scoops
           self.orders.enqueue(order)
   
           print("Order Created!")
           print(order)
           # return self.order
       else:
           print("Sorry, we don't have that flavor.
    Pick another flavor or less scoops.")
   

3. 让我们改变功能show_all_orders

   def show_all_orders(self):
       self.orders.show_queue()
   

4. 在这里我们可以给客户下一个订单并从队列中删除

   def next_order(self):
       # show next order in queue
       print("Next Order...")
       return self.orders.dequeue()