请帮我用python语言编写一个完整的学生成绩管理系统，学生成绩信息包括：学期、学号、班别、姓名、四门课程成绩(语文、数学、英语和 Python)，具体实现以下七个功能： (1)创建信息并以磁盘文件保...

好的，以下是一个简单的学生成绩管理系统的Python代码，实现了您所需的七个功能：

import os

# 学生信息类
class Student:
    def __init__(self, semester, student_id, class_name, name, chinese_score, math_score, english_score, python_score):
        self.semester = semester
        self.student_id = student_id
        self.class_name = class_name
        self.name = name
        self.chinese_score = chinese_score
        self.math_score = math_score
        self.english_score = english_score
        self.python_score = python_score

# 学生成绩管理系统类
class StudentScoreManagementSystem:
    def __init__(self):
        self.students = []
        self.file_name = 'students.txt'

    # 创建信息并以磁盘文件保存
    def create_student(self):
        semester = input("请输入学期：")
        student_id = input("请输入学号：")
        class_name = input("请输入班别：")
        name = input("请输入姓名：")
        chinese_score = input("请输入语文成绩：")
        math_score = input("请输入数学成绩：")
        english_score = input("请输入英语成绩：")
        python_score = input("请输入Python成绩：")
        student = Student(semester, student_id, class_name, name, chinese_score, math_score, english_score, python_score)
        self.students.append(student)
        self.save_students_to_file()

    # 读取磁盘文件中的学生信息
    def read_students_from_file(self):
        if os.path.exists(self.file_name):
            with open(self.file_name, 'r') as f:
                lines = f.readlines()
                for line in lines:
                    items = line.strip().split(',')
                    student = Student(items[0], items[1], items[2], items[3], items[4], items[5], items[6], items[7])
                    self.students.append(student)

    # 将学生信息保存到磁盘文件中
    def save_students_to_file(self):
        with open(self.file_name, 'w') as f:
            for student in self.students:
                f.write('{},{},{},{},{},{},{},{}\n'.format(student.semester, student.student_id, student.class_name, student.name, student.chinese_score, student.math_score, student.english_score, student.python_score))

    # 根据学号查询学生信息
    def query_student_by_id(self):
        student_id = input("请输入学号：")
        for student in self.students:
            if student.student_id == student_id:
                print("学期：{}，学号：{}，班别：{}，姓名：{}，语文成绩：{}，数学成绩：{}，英语成绩：{}，Python成绩：{}".format(student.semester, student.student_id, student.class_name, student.name, student.chinese_score, student.math_score, student.english_score, student.python_score))

    # 根据班别查询学生信息
    def query_student_by_class(self):
        class_name = input("请输入班别：")
        for student in self.students:
            if student.class_name == class_name:
                print("学期：{}，学号：{}，班别：{}，姓名：{}，语文成绩：{}，数学成绩：{}，英语成绩：{}，Python成绩：{}".format(student.semester, student.student_id, student.class_name, student.name, student.chinese_score, student.math_score, student.english_score, student.python_score))

    # 根据姓名查询学生信息
    def query_student_by_name(self):
        name = input("请输入姓名：")
        for student in self.students:
            if student.name == name:
                print("学期：{}，学号：{}，班别：{}，姓名：{}，语文成绩：{}，数学成绩：{}，英语成绩：{}，Python成绩：{}".format(student.semester, student.student_id, student.class_name, student.name, student.chinese_score, student.math_score, student.english_score, student.python_score))

    # 修改学生信息
    def modify_student(self):
        student_id = input("请输入学号：")
        for student in self.students:
            if student.student_id == student_id:
                student.semester = input("请输入学期：")
                student.class_name = input("请输入班别：")
                student.name = input("请输入姓名：")
                student.chinese_score = input("请输入语文成绩：")
                student.math_score = input("请输入数学成绩：")
                student.english_score = input("请输入英语成绩：")
                student.python_score = input("请输入Python成绩：")
                self.save_students_to_file()
                print("修改成功！")

    # 删除学生信息
    def delete_student(self):
        student_id = input("请输入学号：")
        for student in self.students:
            if student.student_id == student_id:
                self.students.remove(student)
                self.save_students_to_file()
                print("删除成功！")

    # 显示所有学生信息
    def show_all_students(self):
        for student in self.students:
            print("学期：{}，学号：{}，班别：{}，姓名：{}，语文成绩：{}，数学成绩：{}，英语成绩：{}，Python成绩：{}".format(student.semester, student.student_id, student.class_name, student.name, student.chinese_score, student.math_score, student.english_score, student.python_score))

    # 显示菜单
    def show_menu(self):
        print("=" * 30)
        print("学生成绩管理系统")
        print("1.创建信息并以磁盘文件保存")
        print("2.根据学号查询学生信息")
        print("3.根据班别查询学生信息")
        print("4.根据姓名查询学生信息")
        print("5.修改学生信息")
        print("6.删除学生信息")
        print("7.显示所有学生信息")
        print("0.退出系统")
        print("=" * 30)

    # 运行系统
    def run(self):
        self.read_students_from_file()
        while True:
            self.show_menu()
            choice = input("请输入您的选择：")
            if choice == '1':
                self.create_student()
            elif choice == '2':
                self.query_student_by_id()
            elif choice == '3':
                self.query_student_by_class()
            elif choice == '4':
                self.query_student_by_name()
            elif choice == '5':
                self.modify_student()
            elif choice == '6':
                self.delete_student()
            elif choice == '7':
                self.show_all_students()
            elif choice == '0':
                print("谢谢使用，再见！")
                break
            else:
                print("输入有误，请重新输入！")

if __name__ == '__main__':
    system = StudentScoreManagementSystem()
    system.run()

注意：为了保证代码的正确性，需要在当前目录下创建一个名为`students.txt`的文本文件，用于保存学生信息。