There is a hint uable find vc***, the error, if you follow the method of modifying the Python script will find that also need to install vs, installation is not necessarily solve the problem.
A half-day effort, combined with some information on the network finally found the Solution:
1. Open File Download Address: http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
2, Check your own system situation:
The first line shows It's cp35,cp35m,win_amd64, and Here's your system Situation.
3. Download the version you need on this website (HTTP://WWW.LFD.UCI.EDU/~GOHLKE/PYTHONLIBS/#LXML)
Lxml, a binding for the LIBXML2 and Libxslt Libraries.
Lxml-3.6.4-cp27-cp27m-win32.whl
Lxml-3.6.4-cp27-cp27m-win_amd64.whl
Lxml-3.6.4-cp34-cp34m-win32.whl
Lxml-3.6.4-cp34-cp34m-win_amd64.whl
Lxml-3.6.4-cp35-cp35m-win32.whl
LXML-3.6.4-CP35-CP35M-WIN_AMD64.WHL (corresponds to the version shown in the second Step)
Lxml-3.6.4-cp36-cp36m-win32.whl
Lxml-3.6.4-cp36-cp36m-win_amd64.whl
4, here I need to download is LXML-3.6.4-CP35-CP35M-WIN_AMD64.WHL this file, according to the second step of their own choice to determine the need to download which
5, Download the completion of the download file directory, "if not installed wheel This tool will first execute: pip install wheel", then perform pip install LXML-3.6.4-CP35-CP35M-WIN_AMD64.WHL
Installation is successful!
Windows system python3.5 Installing the lxml Library