pip 升级的问题解决办法

转自：http://blog.csdn.net/jasonzzj/article/details/70513544






from: http://blog.chenxiaosheng.com/posts/2016-05-19/pip_upgrade_pip_failure.html
今天在使用 python pip 安装一个 python 包的时候，一直提示：

# pip install --upgrade pip
Requirement already up-to-date: pip in /usr/local/lib/python2.7/dist-packages
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

尝试按说明执行 

pip install --upgrade pip

 ，没有任何报错，但一直升级不成功，百思不得解， 在查看 

man
pip

 的时候，找到如下选项：

-v, --verbose
Give more output. Option is additive, and can be used up to 3 times.

尝试执行 

pip install --upgrade pip -vvv

 终于有更多提示：

1 location(s) to search for versions of pip:
* http://example.url/simple/pip/ Getting page http://example.url/simple/pip/ Starting new HTTP connection (1): example.url
"GET /simple/pip/ HTTP/1.1" 403 247
Could not fetch URL http://example.url/simple/pip/: 403 Client Error: Forbidden for url: http://example.url/simple/pip/ - skipping
Installed version (8.1.2) is most up-to-date (past versions: none)
Requirement already up-to-date: pip in /usr/local/lib/python2.7/dist-packages/pip-8.1.2-py2.7.egg
Cleaning up...

这时才发现，原来在我的 

~/.pip/pip.conf

 配置文件里，

index-url

 使用了一个已经废弃的地址，删除文件后重新升级，一切恢复正常。

这么重要的 debug 信息，pip 默认竟然不输出，继续百思不得其解。:-)