安裝其他模組時候提示需要安裝lxml

本來 pip install lxml,

提示出錯，說要安裝 Microsoft Visual C++ 14.0 is required,， 根據提示到下面網站下載：

http://landinghub.visualstudio.com/visual-cpp-build-tools

下載了個visualcppbuildtools_full.exe，選擇windows 8.1 SDK和.net framework SDK安裝，

----------------------------------------------------------------------------
PS C:\Users\CuteYear> pip install --trusted-host https://pypi.tuna.tsinghua.edu.cn/simple lxml
Collecting lxml
  Using cached lxml-3.7.1.tar.gz
Installing collected packages: lxml
  Running setup.py install for lxml ... error
    Complete output from command c:\python36\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\CuteYear
\\AppData\\Local\\Temp\\pip-build-um0yxhqh\\lxml\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().re
place('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\CuteYear\AppData\Local\Te
.....

.......

ml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_schematron_message.xsl -> build\lib.win-amd64-
3.6\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_schematron_skeleton_for_xslt1.xsl -> build\lib
.win-amd64-3.6\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_svrl_for_xslt1.xsl -> build\lib.win-amd64-3.6\
lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\readme.txt -> build\lib.win-amd64-3.6\lxml\isosche
matron\resources\xsl\iso-schematron-xslt1
    running build_ext
    building 'lxml.etree' extension
    error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visu
alstudio.com/visual-cpp-build-tools

    ----------------------------------------
Command "c:\python36\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\CuteYear\\AppData\\Local\\Temp\\
pip-build-um0yxhqh\\lxml\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.cl
ose();exec(compile(code, __file__, 'exec'))" install --record C:\Users\CuteYear\AppData\Local\Temp\pip-ysk7nf97-record\i
nstall-record.txt --single-version-externally-managed --compile" failed with error code 1 in C:\Users\CuteYear\AppData\L
ocal\Temp\pip-build-um0yxhqh\lxml\，

安裝完成Microsoft Visual C++ 14.0後，重新執行pip install lxml

又提示另外錯誤，發現也沒辦法安裝libxml2，不知咋回事，

索性又解除安裝了Microsoft Visual C++ 14.0，

根據stackoverflow上的討論（http://stackoverflow.com/questions/29440482/how-to-install-lxml-on-windows）

到這裡直接下載lxml windows insaller

     http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml

下載上述whl之後，手動安裝即可：

 pip install .\lxml-3.7.1-cp36-cp36m-win_amd64.whl