linux下升級pip安裝不了第三方庫的解決方案__linux

pip升級到7.0以後，在使用http鏡像進行包安裝及升級的時候往往會有如下提示：

Collecting requests
  The repository located at pypi.douban.com is not a trusted or secure host and is being ignored. If this repository is available via HTTPS it is recommended to use HTTPS instead, otherwise you may silence this warning and allow it anyways with '--trusted-host pypi.douban.com'.
  Could not find a version that satisfies the requirement requests (from versions: )
No matching distribution found for requests

解決辦法如下：
1.安裝時加入 --trusted-host pypi.python.org參數：
 pip --trusted-host pypi.python.org install requests
2.在pip.conf中加入trusted-host選項，該方法是一勞永逸

[global]
timeout = 6000
index-url = http://pypi.douban.com/simple/
[install]
use-mirrors = true
mirrors = http://pypi.douban.com/simple/
trusted-host = pypi.douban.com