centos 升级python3.9.7

更新python3之前需要更新依赖 否则make install时会失败

1. 更新一下yum阿里云的源

   cd /etc/yum.repos.d/
   
   mkdir bak
   
   mv * bak
   
   wget http://mirrors.aliyun.com/repo/Centos-7.repo
   
   wget http://mirrors.aliyun.com/repo/epel-7.repo

2. 在1点基础上安装依赖

   yum -y install zlib-devel bzip2-devel openssl-devel openssl-static ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel lzma gcc
   
   yum -y groupinstall "Development tools"

3. 下载python3.9.7
   

   ​
   wget https://www.python.org/ftp/python/3.9.7/Python-3.9.7.tgz
   
   ​

   其他版本查看https://www.python.org/ftp/python/
4. 解压

   tar -vxzf  Python-3.9.7.tgz
   
   cd Python-3.9.7

5. 安装编译

   ./configure --prefix=/usr/local/python-3.9
   
   
   make && make install

   如果这里失败也可再执行1、2

6. 环境变量配置

   vi /etc/profile

   在最下边输入 保存退出

   export PYTHON_HOME=/usr/local/python3.9
   export PATH=${PYTHON_HOME}/bin:$PATH
   

7. 使得配置的环境变量立即生效：

   source /etc/profile