另外官方表示从2020年开始将不再维护Python2.7
顺便说一下，基于沙盒环境去部署Python3.6，这不会破坏原来的环境，所以不用担心。
Prerequisites
1）CentOS 7 server up and running
2）Sudo priviledged user
#Install python3.6
sudo yum -y update
sudo yum -y install yum-utils groupinstall development epel-release git wget
sudo rpm -Uvh https://centos7.iuscommunity.org/ius-release.rpm
sudo yum install python36u -y
sudo yum -y install python36u-pip python36u-devel
#config env
mkdir -p /data
cd /data
python3.6 -m venv venv
. venv/bin/activate
原文：http://blog.51cto.com/jinyan2049/2108813