想在Linux上安装python 的requests包，报错 找不到文件源。
[tester@Linux tools]$ yum install python-requests -y
Loaded plugins: security
You need to be root to preform this command.
[root@Linux yum.repos.d]# yum install python-requests -y
Loaded plugins: security
Setting up Install Process
Repository rabbitmq_erlang is listed more than once in the configuration
Repository rabbitmq_erlang-source is listed more than once in the configuration
http://mirrors.cloud.aliyuncs.com/epel/6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below wiki article
https://wiki.centos.org/yum-errors
If above article doesn't help to resolve this issue please use https://bugs.centos.org/.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Please verify its path and try again
[root@Linux ~]# cat /etc/yum.repos.d/CentOS-Base.repo
[base]
name=CentOS-6
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.5/os/x86_64/
gpgcheck=0
[roam2free@Linux tools]$ uname -a
Linux Linux 2.6.32-431.23.3.el6.x86_64 #1 SMP Thu Jul 31 17:20:51 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[roam2free@Linux tools]$ python
Python 2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
解决思路一：
百度到 https://blog.csdn.net/dantadanta/article/details/106964051，给出的解决方法为：
1，登陆root帐号
2，cd /etc/yum.repos.d
3，mv CentOS-Base.repo CentOS-Base.repo.bak
4，wget http://mirrors.aliyun.com/repo/Centos-7.repo
5，mv Centos-7.repo CentOS-Base.repo
6， yum clean all
7， yum makecache
8，yum update
4~5步骤可以wget一步到位的
如果你是6开头的centos版本，那么只要将上面的所有7改为6即可
注意一般会备份一个原有的CentOS-Base.repo，我将其命名为CentOS-Base2.repo
但还是同样的错，发现那个404的地址没有切换成功，所以得证我的配置文件没生效
后来将CentOS-Base2.repo改名为CentOS-Base2.repo.bak后才生效不再报错
解决思路二：
直接在Linux环境表 使用python命令安装即可：
[tester@Linux tools]$ pip install requests