Install lxml from http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml for your python version. It's a precompiled WHL with required modules/dependencies.
The site lists several packages, when e.g. using Win32 Python 2.7, use lxml-3.6.1-cp27-cp27m-win32.whl.
Download the file, and then install with
pip install C:\path\to\downloaded\file\lxml-3.6.1-cp27-cp27m-win32.whl
以上是我在英文帖中找到的答案,有人说帖子网页打不开了,我尝试了下可以正常打开,我把内容直接复制上来好了