CentOS7 下 python2.7.5 安装 pip 后再安装 requests包
1、安装epel扩展源：“sudo yum install epel-release”
2、安装python-pip：“sudo yum install python-pip”
3、升级pip：“sudo pip install --upgrade pip”
4、安装requests包：“sudo pip install requests”
5、清除cache：“sudo yum clean all”
1、安装epel扩展源：“sudo yum install epel-release”
2、安装python-pip：“sudo yum install python-pip”
3、升级pip：“sudo pip install --upgrade pip”
4、安装requests包：“sudo pip install requests”
5、清除cache：“sudo yum clean all”