python beautifulsoup4突然TypeError：'NoneType'对象不可调用但它不是None

如何解决python beautifulsoup4突然TypeError：'NoneType'对象不可调用但它不是None

我检查了很多问题/答案，但我可以找到我的解决方案。 这段代码以前很完美，但两天前，它坚持抛出如下错误：

Traceback (most recent call last):

  File "D:\Python\experiments\20210213.py",line 85,in <module>

    ws['B1'] = get_titles[loop_excel].contents[0].strip()

TypeError: 'NoneType' object is not callable

1，我用：

soup = BeautifulSoup(html_text,'html.parser')

2，然后获取标题：

  get_titles = soup.find_all('li',class_='chapter')

3、循环插入标题到excel中：

wb = load_workbook('20210209.xlsx')
time.sleep(5)
ws = wb['Sheet1']
loop_excel = 0
for get_download in get_downloads_soup:
    ws.insert_rows(1,amount=1)
    ws['A1'] = datetime.now(pytz.timezone('Asia/Hong_Kong')).strftime("%Y-%m-%d %H:%M:%S")
    ws['B1'] = get_titles_s[loop_excel].contents[0].strip()
    
    loop_excel = loop_excel + 1

我尝试使用打印来识别 get_titles/contents 等的类型和长度，它有效，

<class 'bs4.element.ResultSet'> 66

所以，我真的不知道为什么会弹出这个错误？

整个事情看起来像：

options = Options()
options.binary_location = r'C:\Program Files\Mozilla Firefox\firefox.exe'
driver = webdriver.Firefox(executable_path=r'C:\Users\louis\geckodriver.exe')
time.sleep(14)

# continue
articles_total_number = 333
page_number_start = 1
loop_download_first_page = 0
downloaded_number = 0

urlwhole = (f'blahblah')
driver.get(urlwhole) 
WebDriverWait(driver,100).until(EC.visibility_of_element_located((By.CLASS_NAME,'chapters')))
time.sleep(30)

# supplementary first run
for page_number in range(page_number_start,page_number_start + 1):

    #preparation
    time.sleep(5)
    get_downloads_selenium = 
    driver.find_elements_by_css_selector('input.downloads') #200 resultset of selenium FirefoxWebElements
    time.sleep(5)
    html_text = driver.page_source
    time.sleep(15)
    soup = BeautifulSoup(html_text,'html.parser')
    time.sleep(15)
    get_titles = soup.find_all('li',class_='chapters')
    time.sleep(15)
    get_chapternumbers = soup.find_all('a',class_="srch-result") # 200 resultset of bs element
    print(type(get_chapternumbers),len(get_chapternumbers))
    get_downloads_soup = soup.find_all('input',class_='downloads')# 200 resultset of bs element
    print(type(get_downloads_soup),len(get_downloads_soup))
    time.sleep(25)


   # record info by excel
   wb = load_workbook('20210209.xlsx')
   time.sleep(5)
   ws = wb['Sheet1']
   loop_excel = 0
   for get_download in get_downloads_soup:
        ws.insert_rows(1,amount=1)
        ws['A1'] = datetime.now(pytz.timezone('Asia/Hong_Kong')).strftime("%Y-%m-%d %H:%M:%S")
        ws['B1'] = get_titles[loop_excel].contents[0].strip()
        ws['C1'] = get_chapternumbers[loop_excel].get_text()
        ws['D1'] = page_number

        loop_excel = loop_excel + 1
    wb.save('20210209.xlsx')
    wb.close()
    print(f'page {page_number} excel recorded!')

我也对record-to-excel过程做了一些测试，我相信get_titles[]有问题，标题是：

<li class="chapters">Safety analysis and other purposes <a href="blahblah/00000651">View details</a></li>

因为 ws['A1'] 运行良好，而 ws['C1'] 也很好。所以请关注这条线。

get_titles[loop_excel].contents[0].strip()

解决方法

我终于确定了它：

<li class="chapters">
  <i>In</i> 
  <i>vitro</i> 
  blahblah1 
  <i>in</i> 
  <i>vitro</i> 
  blahblah2 
 <a href="//0008373">View details</a>
</li>

这就是 get_titles[40] 返回的内容。这就是问题所在。 content[0] 是第一个标签：In，这是一个 Nonetype？为什么这是一个 Nonetype？