1.先安装环境
yum install xz
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
2.下载 https://www.python.org/ftp/python/3.6.0/Python-3.6.5.tar.xz
然后上传到linux系统上
解压： tar xvf Python-3.6.5.tar.xz
进入python目录，cd Python-3.6.5
3.执行命令：
./configure --prefix=/usr/local/python3 一定要指定安装目录
make
make install
4.建立python3的软链接
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
输入python3测试