class Student:
    def __init__(self, student_id, name, age, gender):
        self.student_id = student_id
        self.name = name
        self.age = age
        self.gender = gender
    def display_info(self):
        print(f"學號：{self.student_id}")
        print(f"姓名：{self.name}")
        print(f"年齡：{self.age}")
        print(f"性別：{self.gender}")
class StudentManagementSystem:
    def __init__(self):
        self.students = []
    def add_student(self, student):
        self.students.append(student)
    def remove_student(self, student_id):
        for student in self.students:
            if student.student_id == student_id:
                self.students.remove(student)
                print("刪除成功！")
                return
        print("未找到學號對應(yīng)的學生！")
    def modify_student_info(self, student_id, name, age, gender):
        for student in self.students:
            if student.student_id == student_id:
                student.name = name
                student.age = age
                student.gender = gender
                print("修改成功！")
                return
        print("未找到學號對應(yīng)的學生！")
    def search_student_info(self, keyword):
        for student in self.students:
            if keyword in (student.student_id, student.name):
                student.display_info()
    def display_all_students(self):
        if len(self.students) == 0:
            print("系統(tǒng)中暫無學生信息！")
        else:
            for student in self.students:
                student.display_info()
    def save_students_info(self, filename):
        with open(filename, "w") as file:
            for student in self.students:
                file.write(f"{student.student_id},{student.name},{student.age},{student.gender}\n")
        print("學生信息保存成功！")
    def load_students_info(self, filename):
        self.students = []
        try:
            with open(filename, "r") as file:
                lines = file.readlines()
                for line in lines:
                    student_data = line.strip().split(",")
                    student = Student(student_data[0], student_data[1], int(student_data[2]), student_data[3])
                    self.students.append(student)
            print("學生信息加載成功！")
        except FileNotFoundError:
            print("找不到指定的學生信息文件！")

system = StudentManagementSystem()
# 加載學生信息
system.load_students_info("students.txt")
while True:
    print("===== 學生管理系統(tǒng) =====")
    print("1. 添加學生")
    print("2. 刪除學生")
    print("3. 修改學生信息")
    print("4. 查詢學生信息")
    print("5. 顯示所有學生信息")
    print("6. 保存學生信息")
    print("7. 退出系統(tǒng)")
    choice = input("請輸入操作編號：")
    if choice == "1":
        student_id = input("請輸入學號：")
        name = input("請輸入姓名：")
        age = int(input("請輸入年齡："))
        gender = input("請輸入性別：")
        student = Student(student_id, name, age, gender)
        system.add_student(student)
        print("添加成功！")
    elif choice == "2":
        student_id = input("請輸入要刪除的學號：")
        system.remove_student(student_id)
    elif choice == "3":
        student_id = input("請輸入要修改的學號：")
        name = input("請輸入姓名：")
        age = int(input("請輸入年齡："))
        gender = input("請輸入性別：")
        system.modify_student_info(student_id, name, age, gender)
    elif choice == "4":
        keyword = input("請輸入要查詢的學號或姓名關(guān)鍵字：")
        system.search_student_info(keyword)
    elif choice == "5":
        system.display_all_students()
    elif choice == "6":
        system.save_students_info("students.txt")
    elif choice == "7":
        break
    else:
        print("無效的操作編號，請重新輸入！")
print("感謝使用學生管理系統(tǒng)，再見！")