前一篇讲了如何在linux中安装python 2.7.8，接下来继续安装pip，pip是python安装各种包的工具，是非常腻害的工具

在安装过程中，经常报 ：Nothing to do，有很多原因，其中一个原因是虚拟机竟然没有连网，简直是太扯了，对自己太无语了。。。

1、先安装扩展源EPEL

显然，os中的源已经是安装了，而且是最新版本：

[root@wc1 ~]# yum install epel-release -y
Loaded plugins: fastestmirror,refresh-packagekit,security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * epel: mirror01.idc.hinet.net
 * extras: ftp.sjtu.edu.cn
 * updates: centos.ustc.edu.cn
Package epel-release-6-8.noarch already installed and latest version
Nothing to do

一开始我以为安装pip就是命令：yum -y install pip，但是报错说：找不到数据源。。。

后来搜了一下，才知道要安装的是 python-pip：

[root@wc1 ~]# yum -y install python-pip
Loaded plugins: fastestmirror,security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * epel: mirror.premi.st
 * extras: ftp.sjtu.edu.cn
 * updates: centos.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package python-pip.noarch 0:7.1.0-1.el6 will be installed
--> Processing Dependency: python-setuptools for package: python-pip-7.1.0-1.el6.noarch
--> Running transaction check
---> Package python-setuptools.noarch 0:0.6.10-3.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                  Arch          Version               Repository   Size
================================================================================
Installing:
 python-pip               noarch        7.1.0-1.el6           epel        1.5 M
Installing for dependencies:
 python-setuptools        noarch        0.6.10-3.el6          base        336 k

Transaction Summary
================================================================================
Install       2 Package(s)

Total download size: 1.9 M
Installed size: 8.1 M
Downloading Packages:
(1/2): python-pip-7.1.0-1.el6.noarch.rpm                 | 1.5 MB     00:02     
(2/2): python-setuptools-0.6.10-3.el6.noarch.rpm         | 336 kB     00:00     
--------------------------------------------------------------------------------
Total                                           331 kB/s | 1.9 MB     00:05     
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature,key ID 0608b895: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Importing GPG key 0x0608B895:
 Userid : EPEL (6) <epel@fedoraproject.org>
 Package: epel-release-6-8.noarch (@extras)
 From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : python-setuptools-0.6.10-3.el6.noarch                        1/2 
  Installing : python-pip-7.1.0-1.el6.noarch                                2/2 
  Verifying  : python-pip-7.1.0-1.el6.noarch                                1/2 
  Verifying  : python-setuptools-0.6.10-3.el6.noarch                        2/2 

Installed:
  python-pip.noarch 0:7.1.0-1.el6                                               

Dependency Installed:
  python-setuptools.noarch 0:0.6.10-3.el6                                       

Complete!