Python Web抓取(edX)

Question

我正在尝试下载一个关于edx的课程。请参阅以下自述文件(https://github.com/coursera-dl/edx-dl/blob/master/README.md)。我安装了Anaconda for Windows (我在并行桌面上运行Windows 10 )。

在最后一步中，我输入了以下命令: C:\ edX -dl-master\edx-dl-master>edx-dl -u user@user.com COURSE-URL，然后输入我的edX密码，得到以下内容：

为将来的请求构建初始头。正在获取初始CSRF令牌。找到CSRF令牌。登录到开放式edX站点：https://courses.edx.org/login_ajax从仪表板提取课程信息。

Traceback (most recent call last):
  File "c:\programdata\anaconda3\lib\runpy.py", line 193, in 
_run_module_as_main
    "__main__", mod_spec)
  File "c:\programdata\anaconda3\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\ProgramData\Anaconda3\Scripts\edx-dl.exe\__main__.py", line 9, in <module>
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\edx_dl.py", line 1011, in main
    for selected_course in selected_courses}
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\edx_dl.py", line 1011, in <dictcomp>
    for selected_course in selected_courses}
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\edx_dl.py", line 186, in get_available_sections
sections = page_extractor.extract_sections_from_html(page, BASE_URL)
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\parsing.py", line 403, in extract_sections_from_html
for i, section_soup in enumerate(sections_soup, 1)]
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\parsing.py", line 403, in <listcomp>
for i, section_soup in enumerate(sections_soup, 1)]
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\parsing.py", line 392, in _make_subsections
for i, s in enumerate(subsections_soup, 1)]
  File "c:\programdata\anaconda3\lib\site-packages\edx_dl\parsing.py", line 392, in <listcomp>
for i, s in enumerate(subsections_soup, 1)]
AttributeError: 'NoneType' object has no attribute 'string'

我是Python的新手，不确定我可以采取什么补救措施。