pip是python的包管理工具，pip库中自带了很多python的开源工具包，在使用的时候直接运行pip install就可以下载并安装注册到python模块内，下文将会讨论centos中如何安装pip。
一、安装pip命令
下载pip安装包：
[root@web1 xxx]# wget --no-check-certificate https://pypi.python.org/packages/source/s/setuptools/setuptools-1.4.2.tar.gz
解压tar包：
[root@web1 xxx]# tar -vxf setuptools-1.4.2.tar.gz
进入解压包，并运行安装命令：
[root@web1 xxx]# cd setuptools-1.4.2
[root@web1 xxx]# python2.7 setup.py install
安装完成后，最后安装pip：
[root@web1 xxx]# easy_install-2.7 pip
检测是否已经安装成功：
[root@web1 xxx]# pip --version
pip 1.2 from /usr/local/lib/python2.7/site-packages/pip-1.2-py2.7.egg (python 2.7)
二、pip常用命令
1、查看pip使用帮助：
[root@web1 xxx]# pip help
Usage: pip COMMAND [OPTIONS]
--version show program's version number and exit
-h, --help Show help
-v, --verbose Give more output
-q, --quiet Give less output
--log <FILENAME> Log file where a complete (maximum verbosity) record will be kept
--proxy <PROXY> Specify a proxy in the form user:passwd@proxy.server:port. Note that the user:password@ is optional and required only if you are behind an authenticated proxy. If you provide user@proxy.server:port then you will be prompted for a password.
--timeout <SECONDS> Set the socket timeout (default 15 seconds)
--exists-action <EXISTS_ACTION>
Default action when a path already exists. Use this option more than one time to specify another action if a certain option is not available. Choices: (s)witch,(i)gnore, (w)ipe, (b)ackup
Commands available:
bundle: Create pybundles (archives containing multiple packages)
freeze: Output all currently installed packages (exact versions) to stdout
help: Show available commands
install: Install packages
search: Search PyPI
uninstall: Uninstall packages
unzip: Unzip individual packages
zip: Zip individual packages
2、pip安装python包
[root@web1 xxx]# pip install 安装包名
3、pip卸载已安装的包
[root@web1 xxx]# pip uninstall 包名
4、其它常用命令
freeze: 查看已经安装的python包
help: FAQ查看pip帮助
search: Search PyPI
unzip: 解压一个包
zip: 压缩一个已经安装的包