帮我写个学生成绩管理系统

好的，学生成绩管理系统通常包括以下功能：

1. 学生信息管理：包括学生姓名、学号、班级、联系方式等信息。
2. 课程管理：包括课程名称、课程编号、授课教师等信息。
3. 成绩管理：包括学生的考试成绩、平时成绩、总成绩等信息。
4. 查询功能：可以根据学生姓名、学号、课程名称等关键词进行查询。
5. 统计分析：可以根据不同的维度，如班级、课程等进行成绩的统计分析。

下面是一个简单的学生成绩管理系统的代码示例：

class Student:
    def __init__(self, name, id, cls, phone):
        self.name = name
        self.id = id
        self.cls = cls
        self.phone = phone

class Course:
    def __init__(self, name, id, teacher):
        self.name = name
        self.id = id
        self.teacher = teacher

class Score:
    def __init__(self, student, course, exam_score, daily_score):
        self.student = student
        self.course = course
        self.exam_score = exam_score
        self.daily_score = daily_score
        self.total_score = exam_score * 0.7 + daily_score * 0.3

class GradeSystem:
    def __init__(self):
        self.students = []
        self.courses = []
        self.scores = []

    def add_student(self, name, id, cls, phone):
        student = Student(name, id, cls, phone)
        self.students.append(student)

    def add_course(self, name, id, teacher):
        course = Course(name, id, teacher)
        self.courses.append(course)

    def add_score(self, student_id, course_id, exam_score, daily_score):
        student = next((s for s in self.students if s.id == student_id), None)
        course = next((c for c in self.courses if c.id == course_id), None)
        if student and course:
            score = Score(student, course, exam_score, daily_score)
            self.scores.append(score)
        else:
            print("Student or course not found.")

    def get_student_scores(self, student_id):
        student = next((s for s in self.students if s.id == student_id), None)
        if student:
            student_scores = []
            for score in self.scores:
                if score.student.id == student_id:
                    student_scores.append(score)
            return student_scores
        else:
            print("Student not found.")

    def get_course_scores(self, course_id):
        course = next((c for c in self.courses if c.id == course_id), None)
        if course:
            course_scores = []
            for score in self.scores:
                if score.course.id == course_id:
                    course_scores.append(score)
            return course_scores
        else:
            print("Course not found.")

    def get_top_scores(self, n):
        top_scores = sorted(self.scores, key=lambda s: s.total_score, reverse=True)[:n]
        return top_scores

这个系统包含了三个类：学生、课程和成绩，以及一个成绩系统类。在成绩系统类中，我们可以添加学生、课程和成绩信息，并且可以根据学生或课程ID查询成绩，也可以查询总成绩排名前n的学生。