经常在安装python安装包的时候提示安装失败，仔细查看失败原因，发现是网站pypi.python.org访问超时导致的，比如：
Installed f:\fortest\python\lib\site-packages\wechat_sdk-0.5.8-py2.7.egg
Processing dependencies for wechat-sdk==0.5.8
Searching for requests>=2.6.0
Reading https://pypi.python.org/simple/requests/
Download error on https://pypi.python.org/simple/requests/: _ssl.c:489: The handshake operation timed out — Some packages may not be found!
Couldn’t find index page for ‘requests’ (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.python.org/simple/
Download error on https://pypi.python.org/simple/: _ssl.c:489: The handshake operation timed out — Some packages may not be found!
No local packages or download links found for requests>=2.6.0
error: Could not find suitable distribution for Requirement.parse(‘requests>=2.6.0’)
Processing dependencies for wechat-sdk==0.5.8
Searching for requests>=2.6.0
Reading https://pypi.python.org/simple/requests/
Download error on https://pypi.python.org/simple/requests/: _ssl.c:489: The handshake operation timed out — Some packages may not be found!
Couldn’t find index page for ‘requests’ (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.python.org/simple/
Download error on https://pypi.python.org/simple/: _ssl.c:489: The handshake operation timed out — Some packages may not be found!
No local packages or download links found for requests>=2.6.0
error: Could not find suitable distribution for Requirement.parse(‘requests>=2.6.0’)
不管是pip安装还是pip命令安装，或者自己手动下载后安装，都有可能碰到这个问题，主要原因就是网站pypi.python.org在国内是被墙了的，在安装程序的时候，无法从python官网下载资料导致的。
解决这个问题的方法，就是用国内的镜像资料库替换pypi.python.org，本文尝试将资料库下载地址替换成豆瓣的源。
pip命令安装
在pip工具的安装目录找到配置文件~/.pip/pip.conf，在里面添加如下代码：
[global]
index-url = http://pypi.douban.com/simple
index-url = http://pypi.douban.com/simple
配置完成，接着就可以开始运行pip命令进行安装了。如果在pip目录下没找到文件php.conf，那么我们也可以使用pip命令安装的时候手动指定源地址：
pip install web.py -i http://pypi.douban.com/simple
setup.py手动安装
在setup.py文件的同级目录下，新建文件setup.cfg，在文件中加入如下代码：
[easy_install]
index_url = http://pypi.douban.com/simple
index_url = http://pypi.douban.com/simple
完成之后，运行命令“python setup.py install” ，成功安装。
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