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<>好友管理系统
1、实验题目：好友管理系统
请设计一个好友管理系统，每个功能都对应一个序号，用户可根据提示“请输入您的选项”选择序号执行相应的操作，包括：
（1）添加好友：用户根据提示“请输入要添加的好友：”输入要添加好友的姓名，添加后会提示“好友添加成功”。
（2）删除好友：用户根据提示“请输入删除好友姓名：”输入要删除好友的姓名，删除后提示“删除成功”。
（3）备注好友：用户根据提示“请输入要修改的好友姓名：”和“请输入修改后的好友姓名：”分别输入修改前和修改后的好友姓名，修改后会提示“备注成功”。
（4）展示好友：若用户还没有添加过好友，提示“好友列表为空”，否则返回每个好友的姓名。
（5）退出：关闭好友系统。
list_f = [] print("好友管理系统") print("1.添加好友") print("2.删除好友") print("3.备注好友")
print("4.展示好友") print("5.退出") while True: n = int(input("请输入您的选项:")) if n == 1:
f= input("请输入要添加的好友：") list_f.append(f) print("好友添加成功") elif n == 2: f = input(
"请输入删除好友姓名：") list_f.remove(f) print("删除成功") elif n == 3: o_name = input(
"请输入要修改的好友姓名：") n_name = input("请输入修改后的好友姓名：") i = list_f.index(o_name) list_f[i
] = n_name print("备注成功") elif n == 4: if len(list_f) == 0: print("好友列表为空") else:
for m in list_f: print(m) elif n == 5: break print("关闭好友系统")
重点：
1.建一个空列表存放好友信息。
2.append（）添加
3.remove（）删除
4.index（）索引匹配第一次出现的位置
