1.安装依赖包

yum install gcc openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel libffi-devel tk-devel wget curl-devel

2.下载python压缩包

curl -o https://www.python.org/ftp/python/3.6.0/Python-3.6.0.tgz

3.解压文件

tar xf Python-3.6.0.tgz

4.进入Python-3.6.0，编译安装

cd Python-3.6.0
./configure 
#或者
#./configure --prefix=/usr/local/python3
make
sudo make install 

5.使用python3作为默认版本

sudo vim /etc/profile.d/python.sh

编辑文件如下

alias python='/usr/local/bin/python3.6'

设置权限

chmod 755 /etc/profile.d/python.sh

重启会话使其生效

source /etc/profile.d/python.sh