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

windows 64位操作系统下，用 Python 抓取网页，并用 pyQuery 解析网页

pyQuery是jQuery在python中的实现，能够以jQuery的语法来操作解析HTML文档，十分方便。使用前需要安装，easy_install pyquery即可，或者Ubuntu下
详情参考：
http://blog.csdn.net/zhaoyl03/article/details/8631645

但是用pip命令安装pyquey的时候，报错了

pip install pyquery

提示需要先安装 lxml ，于是用如下命令安装 lxml

pip install lxml

 报错

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

查资料，知乎上找到如下解决方案：https://www.zhihu.com/question/30047496 亲测有效。

1. 安装wheel，命令行运行：
pip install wheel
2.在这里下载对应的.whl文件，注意别改文件名！ http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
3. 进入.whl所在的文件夹，执行命令即可完成安装
pip install 带后缀的完整文件名

从上面的地址下载到适合我电脑的whl文件：lxml-3.6.4-cp27-cp27m-win_amd64.whl

然后在安装 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