python简单的学生成绩管理系统

以下是一个简单的Python学生成绩管理系统的实现，包括添加学生信息、查询学生信息、删除学生信息、修改学生信息、排序、统计学生总人数和显示所有学生信息等功能：

# 定义学生类
class Student:
    def __init__(self, name, score):
        self.name = name
        self.score = score

# 定义学生信息管理系统类
class StudentSystem:
    def __init__(self):
        self.students = []

    # 添加学生信息
    def add_student(self, name, score):
        student = Student(name, score)
        self.students.append(student)

    # 查询学生信息
    def query_student(self, name):
        for student in self.students:
            if student.name == name:
                return student
        return None

    # 删除学生信息
    def delete_student(self, name):
        student = self.query_student(name)
        if student:
            self.students.remove(student)
            return True
        else:
            return False

    # 修改学生信息
    def modify_student(self, name, score):
        student = self.query_student(name)
        if student:
            student.score = score
            return True
        else:
            return False

    # 排序
    def sort_students(self):
        self.students.sort(key=lambda x: x.score, reverse=True)

    # 统计学生总人数
    def count_students(self):
        return len(self.students)

    # 显示所有学生信息
    def show_students(self):
        for student in self.students:
            print("姓名：{}，成绩：{}".format(student.name, student.score))

# 系统界面
def menu():
    print('============学生信息管理系统============')
    print('---------------功能菜单---------------')
    print('\t\t\t1.录入学生信息')
    print('\t\t\t2.查找学生信息')
    print('\t\t\t3.删除学生信息')
    print('\t\t\t4.修改学生信息')
    print('\t\t\t5.排序')
    print('\t\t\t6.统计学生总人数')
    print('\t\t\t7.显示所有学生信息')
    print('\t\t\t0.退出系统')
    print('-------------------------------------')

# 主函数
def main():
    student_system = StudentSystem()
    while True:
        menu()
        choice = input("请输入您的选择：")
        if choice == '1':
            name = input("请输入学生姓名：")
            score = int(input("请输入学生成绩："))
            student_system.add_student(name, score)
            print("添加成功！")
        elif choice == '2':
            name = input("请输入要查询的学生姓名：")
            student = student_system.query_student(name)
            if student:
                print("姓名：{}，成绩：{}".format(student.name, student.score))
            else:
                print("查无此人！")
        elif choice == '3':
            name = input("请输入要删除的学生姓名：")
            if student_system.delete_student(name):
                print("删除成功！")
            else:
                print("查无此人！")
        elif choice == '4':
            name = input("请输入要修改的学生姓名：")
            score = int(input("请输入学生成绩："))
            if student_system.modify_student(name, score):
                print("修改成功！")
            else:
                print("查无此人！")
        elif choice == '5':
            student_system.sort_students()
            print("排序成功！")
        elif choice == '6':
            count = student_system.count_students()
            print("学生总人数为：{}".format(count))
        elif choice == '7':
            student_system.show_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__':
    main()