下载地址：
https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz
1.下载依赖程序

yum -y install zlib-devel bzip2-devel openssl-devel openssl-static ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel lzma 

2.下载包
切换到software目录下，使用wget安装python

cd /software
wget https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz
ll

3.解压
解压并打开文件夹

tar -zxf Python-3.6.3.tgz
cd Python-3.6.3.tgz
ll

4.预编译
选择路径，此处为/usr/local/python3

./configure --prefix=/usr/local/python3 --enable-optimizations

5.编译
大概20分钟

make

6.安装

make install

7.运行
进入Python3目录

cd /usr/local/python3/
ll
ll bin
bin/python3

打开python后输入命令

print('hello world')

输出hello world
按

exit()

退出

注意：centOS本身就安装了Python2，如上图输入python后显示。