安装依赖包

　　yum -y groupinstall development

　　yum install -y libffi-devel zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel libffi-devel

下载tgz包并解压

　　tar xf Python-3.x.x.tgz

进入解压后文件夹

　　cd Python-3.x.x

配置安装路径并安装

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

　　make && make install

添加环境变量

　　cd /etc/profile.d

　　echo 'export PATH=$PATH:/usr/local/python3/bin/' > python3.sh