用PYTHON设计一个学生成绩管理系统，要求能够添加数据、查询数据、修改数据、删除数据，具有数据录入、计算、按数值排序、最高分和最低分计算等功能。信息输入和输出要简洁明了，增加必要的提示等，界面友好

为了创建一个简单的学生成绩管理系统，我们可以使用Python的内置模块如`csv`来处理数据文件，以及`argparse`库来提供命令行交互界面。以下是这个系统的基本设计：

import csv
from operator import itemgetter

class StudentRecord:
    def __init__(self, name, score):
        self.name = name
        self.score = score

def read_data(file_path):
    with open(file_path, 'r', newline='') as file:
        reader = csv.reader(file)
        data = [StudentRecord(row[0], float(row[1])) for row in reader]
    return data

def write_data(data, file_path):
    with open(file_path, 'w', newline='') as file:
        writer = csv.writer(file)
        writer.writerow(['Name', 'Score'])
        writer.writerows([(student.name, student.score) for student in data])

def add_student(data, new_student):
    data.append(new_student)

def update_score(data, name, new_score):
    for student in data:
        if student.name == name:
            student.score = new_score
            break

def delete_student(data, name):
    data = [student for student in data if student.name != name]

def find_scores(data, operation='min', value=None):
    scores = sorted(data, key=lambda x: x.score, reverse=operation == 'max')
    if value:
        return [student for student in scores if student.score == value]
    else:
        return scores

# 主程序入口
if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Student Management System")
    subparsers = parser.add_subparsers(title="Commands")

    # 添加学生
    add_parser = subparsers.add_parser("add", help="Add a new student")
    add_parser.add_argument("name", type=str, help="Student's name")
    add_parser.add_argument("score", type=float, help="Student's score")
    add_parser.set_defaults(func=add_student)

    # 查询数据
    query_parser = subparsers.add_parser("query", help="Query students by name or score")
    query_parser.add_argument("option", choices=["all", "name", "score"], help="Option to search")
    query_parser.add_argument("value", nargs="?", type=str, help="Value to match")
    query_parser.set_defaults(func=lambda args: print(find_scores(read_data("students.csv"), args.option, args.value)))

    # 修改分数
    modify_parser = subparsers.add_parser("modify", help="Modify a student's score")
    modify_parser.add_argument("name", type=str, help="Student's name")
    modify_parser.add_argument("new_score", type=float, help="New score")
    modify_parser.set_defaults(func=update_score)

    # 删除学生
    delete_parser = subparsers.add_parser("delete", help="Delete a student")
    delete_parser.add_argument("name", type=str, help="Student's name")
    delete_parser.set_defaults(func=delete_student)

    args = parser.parse_args()

    data = read_data("students.csv")
    args.func(data, **vars(args))

    # 提示用户操作结果
    if 'func' in vars(args):
        print(f"Operation completed. Data saved at 'students.csv'.")

在这个系统中，你可以通过命令行执行如下操作：

- `python manage.py add <name> <score>`: 添加新学生
- `python manage.py query all|name <value>|score <value>`: 查询所有学生、按名字或分数筛选
- `python manage.py modify <name> <new_score>`: 更新学生分数
- `python manage.py delete <name>`: 删除学生

请注意，你需要先运行一次`python manage.py add`来初始化数据文件。另外，这个例子假设所有的输入都是有效的，实际应用中需要加入错误检查和异常处理。