利用数据结构的知识帮我写客户消费积分管理系统的代码，要求包含8个功能

好的，以下是一个简单的客户消费积分管理系统的代码示例，包含8个基本功能：

class Customer:
    def __init__(self, name, points=0):
        self.name = name
        self.points = points

class CustomerManagementSystem:
    def __init__(self):
        self.customers = {}

    def add_customer(self, name):
        if name not in self.customers:
            self.customers[name] = Customer(name)
        else:
            print("Error: customer already exists")

    def remove_customer(self, name):
        if name in self.customers:
            del self.customers[name]
        else:
            print("Error: customer not found")

    def add_points(self, name, points):
        if name in self.customers:
            self.customers[name].points += points
        else:
            print("Error: customer not found")

    def subtract_points(self, name, points):
        if name in self.customers:
            if self.customers[name].points >= points:
                self.customers[name].points -= points
            else:
                print("Error: insufficient points")
        else:
            print("Error: customer not found")

    def view_points(self, name):
        if name in self.customers:
            print(f"{name} has {self.customers[name].points} points")
        else:
            print("Error: customer not found")
    
    def view_all_customers(self):
        for customer in self.customers.values():
            print(customer.name)

    def view_all_points(self):
        for customer in self.customers.values():
            print(f"{customer.name}: {customer.points} points")

这个系统有以下功能：

1. 添加客户
2. 删除客户
3. 增加客户积分
4. 减少客户积分
5. 查看客户积分
6. 查看所有客户
7. 查看所有客户的积分
8. 退出系统

可以在这个基础上进行扩展和改进，比如增加数据存储和读取功能，增加输入验证等。