用Python写一个学生信息管理系统

students = {} def add_student(): id = input("请输入学生学号：") name = input("请输入学生姓名：") gender = input("请输入学生性别：") age = input("请输入学生年龄：") students[id] = {"name": name, "gender": gender, "age": age} print("添加成功！") def delete_student(): id = input("请输入要删除的学生学号：") if id in students: del students[id] print("删除成功！") else: print("学生不存在！") def modify_student(): id = input("请输入要修改的学生学号：") if id in students: name = input("请输入学生姓名：") gender = input("请输入学生性别：") age = input("请输入学生年龄：") students[id] = {"name": name, "gender": gender, "age": age} print("修改成功！") else: print("学生不存在！") def query_student(): id = input("请输入要查询的学生学号：") if id in students: print(students[id]) else: print("学生不存在！") def show_students(): for id in students: print(id, students[id]) while True: print("1. 添加学生信息") print("2. 删除学生信息") print("3. 修改学生信息") print("4. 查询学生信息") print("5. 显示所有学生信息") print("0. 退出系统") choice = input("请输入您的选择：") if choice == "1": add_student() elif choice == "2": delete_student() elif choice == "3": modify_student() elif choice == "4": query_student() elif choice == "5": show_students() elif choice == "0": print("谢谢使用，再见！") break else: print("输入有误，请重新输入！")