为啥明明已经等待到了normal_passerger_id，还是显示timout???

slhlde

    def ticketOrder(self):
        #trains=self.driver.find_elements_by_class_name('t-num')
        trains_number = self.driver.find_elements_by_class_name('number')
        print(trains_number)
        #print(trains)
        for i,item in enumerate(trains_number):
            print('[{}]{}'.format(i,item.text))
        num=input('请输入预定车次编号：')
        self.driver.find_element_by_class_name('btn72').click()

       ul=WebDriverWait(self.driver,10,0.5).until(EC.presence_of_element_located((By.ID,'normal_passerger_id')))


        time.sleep(2)
        lis=ul.find_elements_by_tag_name('li')
        print(lis)
        for i,item in enumerate(lis):
            print('[{}]{}'.format(i,item.find_elements_by_tag_name("label")[0].text))
        num=input('请输入购票人编号：')
        buy_num=int(num)
        lis[int(num)].find_elements_by_tag_name('input')[0].click()


报错显示：：
Traceback (most recent call last):
  File "E:/Projects/Python-Spiders/12306_2/buy_tickets.py", line 198, in <module>
    Demo()()
  File "E:/Projects/Python-Spiders/12306_2/buy_tickets.py", line 196, in __call__
    self.ticketOrder()
  File "E:/Projects/Python-Spiders/12306_2/buy_tickets.py", line 123, in ticketOrder
    ul=WebDriverWait(self.driver,10,0.5).until(EC.presence_of_element_located((By.ID,'normal_passerger_id')))
  File "C:\Python36\lib\site-packages\selenium\webdriver\support\wait.py", line 80, in until
    raise TimeoutException(message, screen, stacktrace)
selenium.common.exceptions.TimeoutException: Message:

XiaoPaiShen

代码没贴全？