win7-64 位操作系统下，联网安装selenium

下载官网 https://pip.pypa.io/en/latest/installing.html

官网截图如下：

pip included with Python¶

Python 2.7.9 and later (on the python2 series), and Python 3.4 and later include pip by default [1], so you may have pip already.

Install pip¶

To install pip, securely download get-pip.py. [2]

Then run the following (which may require administrator access):

python get-pip.py

安装selenium，联网状态的话，可以直接在C:\Python27\Scripts 下输入命令安装：

pip install -U selenium

备注 ：若无联网，先把selenium-2.40.0.tar.gz解压到:C:\Python27\Lib\site-packages 目录下，打开命令提示符（开始---cmd 回车），使用cd命令进入C:\Python27\Lib\site-packages\ selenium-2.40.0目录下，输入python setup.py install回车，selenium安装完成