在windows系统中实现python3安装lxml
lxml是Python中与XML及HTML相关功能中最丰富和最容易使用的库。lxml并不是Python自带的包，而是为libxml2和libxslt库的一个Python化的绑定。它与众不同的地方是它兼顾了这些库的速度和功能完整性，以及纯Python API的简洁性，与大家熟知的ElementTree API兼容但比之更优越！但安装lxml却又有点麻烦，因为存在依赖，直接安装的话用easy_install, pip都不能成功，会报gcc错误。
爬虫时通常要安装LXML，对于通过一下命令行
pip install lxml
出现如下错误的解决方法
lxml Unable to find vcvarsall.bat
1. 安装wheel，命令行运行：
pip install wheel
2.在这里下载对应的.whl文件（打开网址后ctrl+F，搜索LXML，选择对应版本，一般是win32，而不选win_arm64，即使电脑是win64）
http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
3. 进入.whl所在的文件夹->shift+鼠标右键->在此处打开命令窗口
4.执行命令即可完成安装：
pip install lxml-3.6.0-cp35-cp35m-win32.whl
另外附上Linux系统中安装LXML的教程
因为lxml依赖的包如下:
libxml2, libxml2-devel, libxlst, libxlst-devel, python-libxml2, python-libxslt
所以安装步骤如下:
第一步: 安装 libxml2
$ sudo apt-get install libxml2 libxml2-dev
第二步: 安装 libxslt
$ sudo apt-get install libxlst libxslt-dev
第三步: 安装 python-libxml2 和 python-libxslt
$ sudo apt-get install python-libxml2 python-libxslt
第四步: 安装 lxml
$ sudo easy_install lxml
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