设计一个学生类，包含学号、姓名、语文成绩、数学成绩和英语成绩等数据成员。 引入OS模块，用于导入导出路径文件信息 设计一个学生管理类，用于定义各个模块的具体功能函数。 设计一个主菜单，两个子菜单，分别管理学生基本信息和学生成绩信息

好的，根据您的要求，我为您设计了以下代码，实现了一个基本的学生信息和成绩管理系统。由于这只是一个简单的示例，代码中可能存在一些不足之处，仅供参考。

import os

class Student:
    def __init__(self, id, name, chinese, math, english):
        self.id = id
        self.name = name
        self.chinese = chinese
        self.math = math
        self.english = english

class StudentManager:
    def __init__(self):
        self.students = []

    def load_students(self, path):
        if not os.path.exists(path):
            print("文件不存在！")
            return
        with open(path, "r", encoding="utf-8") as f:
            lines = f.readlines()
            for line in lines:
                items = line.strip().split(",")
                if len(items) == 5:
                    student = Student(items[0], items[1], float(items[2]), float(items[3]), float(items[4]))
                    self.students.append(student)

    def save_students(self, path):
        with open(path, "w", encoding="utf-8") as f:
            for student in self.students:
                f.write("{},{},{},{},{}\n".format(student.id, student.name, student.chinese, student.math, student.english))

    def add_student(self, student):
        self.students.append(student)

    def remove_student(self, id):
        for i, student in enumerate(self.students):
            if student.id == id:
                del self.students[i]
                return True
        return False

    def modify_student(self, id, name, chinese, math, english):
        for student in self.students:
            if student.id == id:
                student.name = name
                student.chinese = chinese
                student.math = math
                student.english = english
                return True
        return False

    def query_student(self, id):
        for student in self.students:
            if student.id == id:
                return student
        return None

    def query_all_students(self):
        return self.students

    def get_chinese_max(self):
        max_score = 0
        for student in self.students:
            if student.chinese > max_score:
                max_score = student.chinese
        return max_score

    def get_chinese_min(self):
        min_score = 100
        for student in self.students:
            if student.chinese < min_score:
                min_score = student.chinese
        return min_score

    def get_chinese_avg(self):
        total_score = 0
        for student in self.students:
            total_score += student.chinese
        return total_score / len(self.students)

    def get_math_max(self):
        max_score = 0
        for student in self.students:
            if student.math > max_score:
                max_score = student.math
        return max_score

    def get_math_min(self):
        min_score = 100
        for student in self.students:
            if student.math < min_score:
                min_score = student.math
        return min_score

    def get_math_avg(self):
        total_score = 0
        for student in self.students:
            total_score += student.math
        return total_score / len(self.students)

    def get_english_max(self):
        max_score = 0
        for student in self.students:
            if student.english > max_score:
                max_score = student.english
        return max_score

    def get_english_min(self):
        min_score = 100
        for student in self.students:
            if student.english < min_score:
                min_score = student.english
        return min_score

    def get_english_avg(self):
        total_score = 0
        for student in self.students:
            total_score += student.english
        return total_score / len(self.students)

def main_menu():
    print("1. 学生基本信息管理")
    print("2. 学生成绩管理")
    print("0. 退出系统")

def student_menu():
    print("1. 显示所有学生信息")
    print("2. 添加学生信息")
    print("3. 删除学生信息")
    print("4. 修改学生信息")
    print("5. 查找学生信息")
    print("0. 返回主菜单")

def grade_menu():
    print("1. 统计语文成绩")
    print("2. 统计数学成绩")
    print("3. 统计英语成绩")
    print("0. 返回主菜单")

def input_student_info():
    id = input("请输入学号：")
    name = input("请输入姓名：")
    chinese = float(input("请输入语文成绩："))
    math = float(input("请输入数学成绩："))
    english = float(input("请输入英语成绩："))
    return Student(id, name, chinese, math, english)

def print_student_info(student):
    print("学号：{}，姓名：{}，语文成绩：{}，数学成绩：{}，英语成绩：{}".format(student.id, student.name, student.chinese, student.math, student.english))

if __name__ == "__main__":
    manager = StudentManager()
    while True:
        main_menu()
        choice = input("请选择操作：")
        if choice == "1":
            while True:
                student_menu()
                choice = input("请选择操作：")
                if choice == "1":
                    students = manager.query_all_students()
                    for student in students:
                        print_student_info(student)
                elif choice == "2":
                    student = input_student_info()
                    manager.add_student(student)
                    print("添加成功！")
                elif choice == "3":
                    id = input("请输入要删除的学生学号：")
                    if manager.remove_student(id):
                        print("删除成功！")
                    else:
                        print("删除失败，学号不存在！")
                elif choice == "4":
                    id = input("请输入要修改的学生学号：")
                    student = manager.query_student(id)
                    if student is not None:
                        print_student_info(student)
                        name = input("请输入修改后的姓名：")
                        chinese = float(input("请输入修改后的语文成绩："))
                        math = float(input("请输入修改后的数学成绩："))
                        english = float(input("请输入修改后的英语成绩："))
                        if manager.modify_student(id, name, chinese, math, english):
                            print("修改成功！")
                        else:
                            print("修改失败！")
                    else:
                        print("查无此人！")
                elif choice == "5":
                    id = input("请输入要查找的学生学号：")
                    student = manager.query_student(id)
                    if student is not None:
                        print_student_info(student)
                    else:
                        print("查无此人！")
                elif choice == "0":
                    break
        elif choice == "2":
            while True:
                grade_menu()
                choice = input("请选择操作：")
                if choice == "1":
                    print("语文最高分：{}".format(manager.get_chinese_max()))
                    print("语文最低分：{}".format(manager.get_chinese_min()))
                    print("语文平均分：{}".format(manager.get_chinese_avg()))
                elif choice == "2":
                    print("数学最高分：{}".format(manager.get_math_max()))
                    print("数学最低分：{}".format(manager.get_math_min()))
                    print("数学平均分：{}".format(manager.get_math_avg()))
                elif choice == "3":
                    print("英语最高分：{}".format(manager.get_english_max()))
                    print("英语最低分：{}".format(manager.get_english_min()))
                    print("英语平均分：{}".format(manager.get_english_avg()))
                elif choice == "0":
                    break
        elif choice == "0":
            break