Can someone check if there are some not pythonic solutions?

import datetime
import random
import logging
import os

from questions import Add, Multiply

logging.basicConfig(filename='game.log', level=logging.DEBUG)

class Quiz:

    def __init__(self, questions=[], answers=[], score=[], time=[]):
        self.questions = questions
        self.answers = answers
        self.score = score
        self.time = time
        index = 1
        for question in range(10):
            self.questions.append("{}".format(random.choice([Add(random.randrange(1, 11), (random.randrange(1, 11))).text, Multiply((random.randrange(1, 11)), (random.randrange(1, 11))).text])))
            index += 1
        # generate 10 random questions with numbers from 1 to 10 DONE

        for question in questions:
            question = question.split(' ')
            if question[1] == '+':
                self.answers.append(Add(int(question[0]), int(question[2])).answer)
            elif question[1] == 'x':
                self.answers.append(Multiply(int(question[0]), int(question[2])).answer)

    def __str__(self):
        return str(self.questions)
        # add these questions into self.questions DONE

    def clear_screen(self):
        os.system('cls' if os.name == 'nt' else 'clear')

    def ask(self):
        index = 0
        for question in self.questions:
            print(question)
            user_answer = input("What's the answer? ")
            if int(user_answer) == self.answers[index]:
                self.score.append(1)
                logging.info(True)
                index += 1
            else:
                self.score.append(0)
                logging.info(False)
                index += 1
            self.clear_screen()

        # log the start time DONE
        # capture the answer DONE
        # check the answer DONE
        # log the end time DONE
        # if the answers right senf back True DONE
        # otherwise send back False DONE
        # send back the elapsed time DONE

    def take_quiz(self):
        start = datetime.datetime.now()
        logging.info("Beginning of the quiz: {}".format(start))
        self.ask()
        end = datetime.datetime.now()
        logging.info("The ending of the quiz: {}".format(end))
        your_time = end - start
        self.your_time = your_time
        self.summary()

        # log the start time DONE
        # ask all of the questions DONE
        # log if they got the question right DONE
        # log the end time DONE
        # show a summary DONE


    def summary(self):
        print("You got {} out of {} questions right.".format(sum(self.score), len(self.questions)))
        print("You finished your quiz in {} seconds.".format(self.your_time.seconds))
        print("Here are the lists of the questions and valid answers:\nQuestions: {} \nAnswers: {}".format(self.questions, self.answers))
        # print how many u got right and the total of questions. 5/10 DONE
        # print the total of time for the quiz. 30 seconds DONE