code: def questions(self):
          
          from .question import Question
  
          if self.url is None or self.question_num == 0:
              return
          for page_index in range(1, (self.question_num - 1) // 20 + 2):
              html = self._session.get(
                  self.url + 'asks?page=' + str(page_index)).text
              soup = BeautifulSoup(html)
              question_links = soup.find_all('a', class_='question_link')
              question_datas = soup.find_all(
                  'div', class_='zm-profile-section-main')
              for link, data in zip(question_links, question_datas):
                  url = Zhihu_URL + link['href']
                  title = link.text.strip()
                  answer_num = int(
                      re_get_number.match(data.div.contents[4]).group(1))
                  follower_num = int(
                      re_get_number.match(data.div.contents[6]).group(1))
                  q = Question(url, title, follower_num, answer_num,
                               session=self._session)
                  yield q
docs: 获取用户的所有问题.
  
          :return: 用户的所有问题，返回生成器.
          :rtype: Question.Iterable