用Python制作学生管理系统，具有增加、删除、修改、显示所有、保存到文件、退出功能

好的，我可以为你提供一个基本的学生管理系统的Python代码。请注意，这只是提供一个参考，你可以根据自己的需求进行修改和扩展。

import json

# 定义学生类
class Student:
    def __init__(self, name, age, gender, score):
        self.name = name
        self.age = age
        self.gender = gender
        self.score = score

# 定义学生管理系统类
class StudentManagementSystem:
    def __init__(self):
        self.students = []

    # 添加学生
    def add_student(self, student):
        self.students.append(student)

    # 删除学生
    def remove_student(self, name):
        for student in self.students:
            if student.name == name:
                self.students.remove(student)
                return True
        return False

    # 修改学生信息
    def update_student(self, name, age, gender, score):
        for student in self.students:
            if student.name == name:
                student.age = age
                student.gender = gender
                student.score = score
                return True
        return False

    # 显示所有学生信息
    def show_all_students(self):
        for student in self.students:
            print("Name: {}, Age: {}, Gender: {}, Score: {}".format(student.name, student.age, student.gender, student.score))

    # 保存学生信息到文件
    def save_to_file(self, filename):
        data = []
        for student in self.students:
            data.append({"name": student.name, "age": student.age, "gender": student.gender, "score": student.score})
        with open(filename, "w") as f:
            json.dump(data, f)

    # 从文件中读取学生信息
    def load_from_file(self, filename):
        with open(filename, "r") as f:
            data = json.load(f)
            for student_data in data:
                student = Student(student_data["name"], student_data["age"], student_data["gender"], student_data["score"])
                self.students.append(student)

# 主函数
def main():
    # 创建学生管理系统对象
    sms = StudentManagementSystem()

    # 加载已有学生信息
    sms.load_from_file("students.json")

    # 循环菜单
    while True:
        print("1. Add student")
        print("2. Remove student")
        print("3. Update student")
        print("4. Show all students")
        print("5. Save to file")
        print("6. Quit")

        choice = input("Enter your choice: ")

        if choice == "1":
            name = input("Enter name: ")
            age = input("Enter age: ")
            gender = input("Enter gender: ")
            score = input("Enter score: ")
            student = Student(name, age, gender, score)
            sms.add_student(student)
            print("Student added successfully.")

        elif choice == "2":
            name = input("Enter name: ")
            if sms.remove_student(name):
                print("Student removed successfully.")
            else:
                print("Student not found.")

        elif choice == "3":
            name = input("Enter name: ")
            age = input("Enter age: ")
            gender = input("Enter gender: ")
            score = input("Enter score: ")
            if sms.update_student(name, age, gender, score):
                print("Student updated successfully.")
            else:
                print("Student not found.")

        elif choice == "4":
            sms.show_all_students()

        elif choice == "5":
            filename = input("Enter filename: ")
            sms.save_to_file(filename)
            print("Data saved to file.")

        elif choice == "6":
            break

        else:
            print("Invalid choice. Please try again.")

    print("Goodbye!")

if __name__ == '__main__':
    main()

这个代码中，我们定义了两个类：`Student` 和 `StudentManagementSystem`。`Student` 表示学生，其中包含学生的姓名、年龄、性别和分数。`StudentManagementSystem` 表示学生管理系统，其中包含添加、删除、修改、显示所有、保存到文件和退出等功能。

在 `main()` 函数中，我们创建了一个 `StudentManagementSystem` 对象，并加载已有学生信息。然后进入一个循环菜单，根据用户的输入执行相应的操作，包括添加、删除、修改、显示所有、保存到文件和退出。

你可以根据自己的需求进行修改和扩展这个代码。例如，你可以添加一个搜索学生信息的功能，或者将学生信息存储到数据库中。