如何设计一个支持在线答题中的AI评分的系统

import pandas as pd

# 题库管理模块
class QuestionBank:
    def __init__(self):
        self.data = pd.DataFrame(columns=['question', 'answer'])

    def import_question(self, question, answer):
        self.data = self.data.append({'question': question, 'answer': answer}, ignore_index=True)

    def query_question(self, question):
        return self.data[self.data['question'] == question]

# 用户管理模块
class UserManager:
    def __init__(self):
        self.users = {}

    def register(self, username, password):
        self.users[username] = password

    def login(self, username, password):
        return self.users.get(username) == password

# 答题记录管理模块
class AnswerRecordManager:
    def __init__(self):
        self.records = pd.DataFrame(columns=['username', 'question', 'answer', 'score'])

    def submit_answer(self, username, question, answer, score):
        self.records = self.records.append({'username': username, 'question': question, 'answer': answer, 'score': score}, ignore_index=True)

    def query_score(self, username):
        return self.records[self.records['username'] == username]['score']

# AI评分模块
class AIGrading:
    def __init__(self, question_bank):
        self.question_bank = question_bank

    def grade_answer(self, question, answer):
        correct_answer = self.question_bank.query_question(question)['answer'].values[0]
        score = 0 if answer != correct_answer else 100
        return score

# 测试代码
question_bank = QuestionBank()
user_manager = UserManager()
answer_record_manager = AnswerRecordManager()
ai_grading = AIGrading(question_bank)

# 题库导入
question_bank.import_question('2+2=', '4')
question_bank.import_question('3+3=', '6')

# 用户注册与登录
user_manager.register('user1', 'password123')
user_manager.register('user2', 'password456')
print(user_manager.login('user1', 'password123'))  # True
print(user_manager.login('user1', 'wrongpassword'))  # False

# 答题记录提交与评分
answer_record_manager.submit_answer('user1', '2+2=', '4', ai_grading.grade_answer('2+2=', '4'))
answer_record_manager.submit_answer('user1', '3+3=', '7', ai_grading.grade_answer('3+3=', '7'))
print(answer_record_manager.query_score('user1'))  # [100, 0]