1.下载python源码包Python-3.6.3.tgz
2.下载python3编译的依赖包
yum install -y gcc patch libffi-devel python-devel zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
3.解压python源码包
tar -zxvf Python-3.6.3.tgz -C 解压路径
4.创建python的安装目录
mkdir /opt/python36
5.进入源码包文件夹
6.配置
输入命令./configure --prefix=/opt/python36
7.编译
输入命令make
8.安装
输入命令make install
9.进入python安装目录下的bin文件夹，可以看到安装好的python shell
10.打开配置文件/etc/profile，将python的bin目录加入环境变量，然后重载配置文件或重启
11.输入命令python3.6，即可启动python3.6交互界面
更详细的步骤，可参考：https://www.cnblogs.com/knighterrant/p/10719887.html