CentOS-7安装pip

首先需要安装epel-release拓展源

pip对应的python2.7
pip3ui应的python3.x

yum -y install epel-release

(1)随后，清空cache，并makecache

yum clear all
yum makecache

(2)安装pip 

yum -y install python-pip

(3)升级pip

pip install --upgrade pip