1.到git下载源码zip源码，https://github.com/requests/requests
2.下载了 ZIP包，安装说明：
Once you have a copy of the source, you can embed it in your own Python package, or install it into your site-packages easily:
$ cd requests
$ pip install .3.把requests-master解压到python目录
cd 到 requests-master
运行 pip install .
它自动从pypi下载相关的依赖包，比如，它也下载和安装了certifi , chardet , idna , urllib3
4.另外一种方法：
cmd 进入py D:\python\requests-master
输入命令：python setup.py install 回车即可