1、依赖包安装

   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 libffi-devel

 2. 先安装下载工具wget 

   yum install wget -y

3. 下载python

       下载地址：https://www.python.org/ftp/python/3.8.6/

wget https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tgz

4、解压：

   tar -zxvf Python-3.8.6.tgz

5、安装：

   cd Python-3.8.6

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

   make && make install

6、建立软连接

   ln -s /usr/local/python3/bin/python3.8 /usr/bin/python3

   ln -s /usr/local/python3/bin/pip3.8 /usr/bin/pip3