1.下载安装包
将安装包下载到 /usr/local目录下
wget -i -c https://www.python.org/ftp/python/3.9.7/Python-3.9.7.tgz
2.解压
tar –zxvf Python-3.9.7.tgz
3.安装python的yum依赖
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel libffi-devel gcc make
4.进入解压后的目录，依次执行，其中--prefix是Python的安装目录
./configure --prefix=/usr/local/python3 make make install
5.配置环境变量
修改/etc/profile，在文件末位添加
export PYTHON_HOME=/usr/local/python3 export PATH=$PATH:$PYTHON_HOME/bin
6.检查是否安装成功
python
7.切换python版本
如果系统默认带了python，想切换成刚刚安装的版本，通过软链的方式解决
进入到目录cd /usr/bin
查看python指向
发现python指向了python2,
备份原软链
mv /usr/bin/python /usr/bin/python.bak mv /usr/bin/pip /usr/bin/pip.bak
创建新软链
ln -s /usr/local/python3/bin/python3.9 /usr/bin/python ln -s /usr/local/python3/bin/pip3.9 /usr/bin/pip
8.检查是否切换成功
python
9.因为yum不支持python3，需要把yum默认的python执行改成python2
vim /usr/bin/yum
vim /usr/libexec/urlgrabber-ext-down
将#!/usr/bin/python 改成#!/usr/bin/python2
10.检查yum是否OK
yum list|grep mysql
