从官网下载源码包

wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz

解压

tar xvzf Python-3.6.4.tgz

准备编译需要的依赖

yum install -y gcc zlib zlib-devel openssl openssl-devel

配置并编译

./configure --prefix=/usr/local/python3.6    # 设置安装位置
make
make install

添加环境变量。在/etc/profile文件末尾追加

PATH=$PATH:/usr/local/python3.6/bin
export PATH

使环境变量生效

source /etc/profile

测试，执行python3命令，查看输出