用Python编写学生基本信息与成绩管理程序设计。主要功能是对学生基本信息、课程、课程成绩进行 管理。 (1)学生基本信息包括学号，班级，姓名。能按学号进行信息增加，删除，查询。 (2)课程信息包括课程号，课程名，课程学分。能按课程号进行信息增加，删除，查询。 (3)选课信息。包括学号，课程号，成绩。能够对成绩进行录入，修改，查询。 (4)成绩统计分析。 按课程计算课程平均分，及格率，输出某门课程成绩，绘制各课程平均成绩的统计图(柱状 图或者折线图)；按学号输出学生各门课程成绩，统计学分。

以下是用 Python 编写学生基本信息和成绩管理程序的示例代码：

class Student:
    def __init__(self, student_id, name, grade):
        self.student_id = student_id
        self.name = name
        self.grade = grade

class Course:
    def __init__(self, course_id, name):
        self.course_id = course_id
        self.name = name
        self.students = []

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

    def remove_student(self, student):
        self.students.remove(student)

class Score:
    def __init__(self, student, course, score):
        self.student = student
        self.course = course
        self.score = score

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

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

    def remove_student(self, student):
        self.students.remove(student)

    def add_course(self, course):
        self.courses.append(course)

    def remove_course(self, course):
        self.courses.remove(course)

    def add_score(self, score):
        self.scores.append(score)

    def remove_score(self, score):
        self.scores.remove(score)

    def get_student_by_id(self, student_id):
        for student in self.students:
            if student.student_id == student_id:
                return student
        return None

    def get_course_by_id(self, course_id):
        for course in self.courses:
            if course.course_id == course_id:
                return course
        return None

    def get_score(self, student_id, course_id):
        student = self.get_student_by_id(student_id)
        course = self.get_course_by_id(course_id)
        for score in self.scores:
            if score.student == student and score.course == course:
                return score
        return None

    def calculate_average_score(self, course_id):
        course = self.get_course_by_id(course_id)
        total_score = 0
        count = 0
        for score in self.scores:
            if score.course == course:
                total_score += score.score
                count += 1
        if count == 0:
            return 0
        else:
            return total_score / count

    def generate_course_report(self, course_id):
        course = self.get_course_by_id(course_id)
        report = f"{course.name}\n"
        report += f"{'-' * 30}\n"
        for student in course.students:
            score = self.get_score(student.student_id, course.course_id)
            if score:
                report += f"{student.student_id}\t{student.name}\t{score.score}\n"
            else:
                report += f"{student.student_id}\t{student.name}\tN/A\n"
        report += f"{'-' * 30}\n"
        report += f"Average score: {self.calculate_average_score(course.course_id)}\n"
        return report

    def generate_student_report(self, student_id):
        student = self.get_student_by_id(student_id)
        report = f"{student.name}\n"
        report += f"{'-' * 30}\n"
        for course in self.courses:
            score = self.get_score(student.student_id, course.course_id)
            if score:
                report += f"{course.course_id}\t{course.name}\t{score.score}\n"
            else:
                report += f"{course.course_id}\t{course.name}\tN/A\n"
        report += f"{'-' * 30}\n"