1、yum安装依赖包 避免后面出现少包的问题：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 mysql-devel
2 、在/root目录下新建一个文件夹python368：mkdir python368，然后cd到python368：cd python368，下载python3.6.8包：wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tgz
3、 解压：tar -xvf Python-3.6.8.tgz ，解压完成后：cd Python-3.6.8
4.、指定安装目录：./configure --prefix=/root/python36
5、编译：make
6.、安装：make install
7、添加软链接，我们需要让python3指向python3.6：ln -s /root/python36/bin/python3.6 /usr/bin/python3，可以输入python3，启动的是python3.6
8、设置pip3 软链接：ln -s /root/python36/bin/pip3 /usr/bin/pip3，后面安装python3.6的环境，就用pip3安装