python编程一个面向对象思想的、具有添加好友、删除好友、展示好友、退出功能的好友管理系统

好的，下面是一个简单的面向对象思想的好友管理系统的代码示例：

class Friend:
    def __init__(self, name, phone_number):
        self.name = name
        self.phone_number = phone_number

    def __str__(self):
        return f"{self.name} ({self.phone_number})"


class FriendManager:
    def __init__(self):
        self.friends = []

    def add_friend(self, name, phone_number):
        friend = Friend(name, phone_number)
        self.friends.append(friend)
        print(f"{name} has been added as a friend.")

    def remove_friend(self, name):
        for friend in self.friends:
            if friend.name == name:
                self.friends.remove(friend)
                print(f"{name} has been removed from friends.")
                return
        print(f"{name} is not in your friends list.")

    def show_friends(self):
        if len(self.friends) == 0:
            print("You have no friends.")
        else:
            print("Your friends:")
            for friend in self.friends:
                print(friend)

    def quit(self):
        print("Goodbye!")
        exit()


if __name__ == "__main__":
    friend_manager = FriendManager()
    while True:
        print("\nWhat would you like to do?")
        print("1. Add a friend")
        print("2. Remove a friend")
        print("3. Show friends")
        print("4. Quit")
        choice = input("Enter a number: ")
        if choice == "1":
            name = input("Enter the friend's name: ")
            phone_number = input("Enter the friend's phone number: ")
            friend_manager.add_friend(name, phone_number)
        elif choice == "2":
            name = input("Enter the friend's name: ")
            friend_manager.remove_friend(name)
        elif choice == "3":
            friend_manager.show_friends()
        elif choice == "4":
            friend_manager.quit()
        else:
            print("Invalid choice. Please enter a number from 1-4.")

这个程序定义了两个类：`Friend` 和 `FriendManager`。`Friend` 类表示一个好友，有名字和电话号码属性，还有一个重载的 `__str__` 方法用于打印好友信息。`FriendManager` 类是管理好友的主要类，有添加、删除、展示和退出功能。

在主程序中，我们创建了一个 `FriendManager` 实例，并进入一个循环，让用户选择要进行的操作。根据用户的选择，调用 `FriendManager` 对应的方法来执行相应的操作。