使用pip安装第三方插件
1. 下载Settools和pip，并安装
a. 下载地址：
setuptools : https://pypi.python.org/pypi/setuptools#downloads
pip: https://pypi.python.org/pypi/pip/#downloads
b. 安装方法：
在命令行中进入上面两个工具的解压目录，并执行python setup.py install 来安装两个工具
2. 安装第三方工具，以selenium为例
pip 命令格式：
>>pip list 可以查看已经安装的插件
>>pip show numpy 可以查看插件的信息
>>pip install selenium [version number] 不加版本号就安装最新的release，加版本号可以指定安装哪个版本的selenium。
下面就是安装selenium的过程，最后显示Successfully installed
D:\>pip install selenium
Collecting selenium
Downloading selenium-2.53.-py2.py3-none-any.whl (884kB)
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¨€¨€¨€¨€¨€¨€¨€¨€¨€| 890kB 105kB/s
Installing collected packages: selenium
Successfully installed selenium-2.53.
检查安装结果
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