写一个学生管理系统可以实现添加学生消息、显示学生信息、修改学生信息、删除学生信息、查找学生信息、导入学生信息、导出学生信息的小程序

好的，下面是一个使用 Python 编写的学生管理系统小程序，可以实现添加、显示、修改、删除、查找、导入和导出学生信息的功能。

import csv

# 定义学生类
class Student:
    def __init__(self, id, name, age, gender):
        self.id = id
        self.name = name
        self.age = age
        self.gender = gender
        self.scores = {}

    def add_score(self, subject, score):
        self.scores[subject] = score

    def get_score(self, subject):
        return self.scores.get(subject, 0)

    def __str__(self):
        return f'{self.id}\t{self.name}\t{self.age}\t{self.gender}'

# 定义学生管理系统类
class StudentManager:
    def __init__(self):
        self.students = {}

    def add_student(self, student):
        self.students[student.id] = student

    def get_student(self, id):
        return self.students.get(id)

    def remove_student(self, id):
        del self.students[id]

    def search_student(self, keyword):
        result = []
        for student in self.students.values():
            if keyword in student.id or keyword in student.name:
                result.append(student)
        return result

    def import_students(self, filename):
        with open(filename, 'r') as f:
            reader = csv.reader(f)
            for row in reader:
                id, name, age, gender = row
                student = Student(id, name, age, gender)
                for i in range(4, len(row), 2):
                    subject, score = row[i], row[i+1]
                    student.add_score(subject, int(score))
                self.add_student(student)

    def export_students(self, filename):
        with open(filename, 'w', newline='') as f:
            writer = csv.writer(f)
            for student in self.students.values():
                row = [student.id, student.name, student.age, student.gender]
                for subject, score in student.scores.items():
                    row.extend([subject, score])
                writer.writerow(row)

# 定义主函数
def main():
    manager = StudentManager()

    while True:
        print('欢迎使用学生管理系统')
        print('1. 添加学生信息')
        print('2. 显示学生信息')
        print('3. 修改学生信息')
        print('4. 删除学生信息')
        print('5. 查找学生信息')
        print('6. 导入学生信息')
        print('7. 导出学生信息')
        print('0. 退出系统')

        choice = input('请输入您的选择：')
        if choice == '1':
            id = input('请输入学号：')
            name = input('请输入姓名：')
            age = input('请输入年龄：')
            gender = input('请输入性别：')
            student = Student(id, name, age, gender)
            subject = input('请输入科目名称：')
            score = int(input('请输入分数：'))
            student.add_score(subject, score)
            manager.add_student(student)
            print('添加成功')
        elif choice == '2':
            print('学号\t姓名\t年龄\t性别\t语文\t数学\t英语')
            for student in manager.students.values():
                scores = [student.get_score('语文'), student.get_score('数学'), student.get_score('英语')]
                print(f'{student}\t{"\t".join(str(s) for s in scores)}')
        elif choice == '3':
            id = input('请输入要修改的学生学号：')
            student = manager.get_student(id)
            if student:
                print('学号\t姓名\t年龄\t性别')
                print(student)
                subject = input('请输入要修改的科目名称：')
                score = int(input('请输入要修改的分数：'))
                student.add_score(subject, score)
                print('修改成功')
            else:
                print('学生不存在')
        elif choice == '4':
            id = input('请输入要删除的学生学号：')
            student = manager.get_student(id)
            if student:
                manager.remove_student(id)
                print('删除成功')
            else:
                print('学生不存在')
        elif choice == '5':
            keyword = input('请输入要查找的关键字：')
            result = manager.search_student(keyword)
            if result:
                print('学号\t姓名\t年龄\t性别\t语文\t数学\t英语')
                for student in result:
                    scores = [student.get_score('语文'), student.get_score('数学'), student.get_score('英语')]
                    print(f'{student}\t{"\t".join(str(s) for s in scores)}')
            else:
                print('没有找到符合条件的学生')
        elif choice == '6':
            filename = input('请输入要导入的文件名：')
            manager.import_students(filename)
            print('导入成功')
        elif choice == '7':
            filename = input('请输入要导出的文件名：')
            manager.export_students(filename)
            print('导出成功')
        elif choice == '0':
            print('谢谢使用')
            break
        else:
            print('无效的选择')

if __name__ == '__main__':
    main()

这个小程序使用了 Python 内置的 csv 模块来实现导入和导出学生信息的功能，可以将学生信息保存到 CSV 文件中，便于管理和备份。