1、安装python依赖

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、下载python3（3.8.5）

已下载(Index of /ftp/python/3.8.5/)

3、解压

tar -xzvf Python-3.8.5.tgz

4、安装

cd Python-3.8.5 #切换目录
./configure --prefix=/usr/local/python3  #安装路径
make && make install 

5、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

6、验证是否安装成功

执行python3命令

 执行pip3命令