【Python爬蟲】安裝 pyQuery 遇到的坑 Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?

windows 64位操作系統下，用 Python 抓取網頁，並用 pyQuery 解析網頁

pyQuery是jQuery在python中的實現，能夠以jQuery的語法來操作解析HTML文檔，十分方便。使用前需要安裝，easy_install pyquery即可，或者Ubuntu下
詳情參考：
http://blog.csdn.net/zhaoyl03/article/details/8631645

但是用pip命令安裝pyquey的時候，報錯了

pip install pyquery

提示需要先安裝 lxml ，於是用如下命令安裝 lxml

pip install lxml

 報錯

Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?

查資料，知乎上找到如下解決方案：https://www.zhihu.com/question/30047496 親測有效。

1. 安裝wheel，命令行運行：
pip install wheel
2.在這里下載對應的.whl文件，注意別改文件名！ http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
3. 進入.whl所在的文件夾，執行命令即可完成安裝
pip install 帶后綴的完整文件名

從上面的地址下載到適合我電腦的whl文件：lxml-3.6.4-cp27-cp27m-win_amd64.whl

然后在安裝 pyquery，成功搞定！

C:\Python27\Scripts>pip install lxml-3.6.4-cp27-cp27m-win_amd64.whl
Processing c:\python27\scripts\lxml-3.6.4-cp27-cp27m-win_amd64.whl
Installing collected packages: lxml
Successfully installed lxml-3.6.4

C:\Python27\Scripts>pip install pyquery
Collecting pyquery
  Using cached pyquery-1.2.17-py2.py3-none-any.whl
Requirement already satisfied: lxml>=2.1 in c:\python27\lib\site-packages (from
pyquery)
Requirement already satisfied: cssselect>0.7.9 in c:\python27\lib\site-packages
(from pyquery)
Installing collected packages: pyquery
Successfully installed pyquery-1.2.17