一、安装依赖环境
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
二、下载python3
cd /opt
wget https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tgz
三、安装python3
1、新建安装目录
mkdir -p /usr/local/python3
2、进入到下载路径
cd /opt
3、解压下载的安装包
tar -zxvf python3.8.6 tgz
4、编译安装需要编译器：
yum install gcc
3.7后的版本还有一个依赖包：
yum install libffi-devel -y
5、进入到解压目录，生成编译文件指定安装路径
cd Python-3.8.6
./configure --prefix=/usr/local/python3
6、编译
make
7、编译成功后，安装
make install
8、检查python3.8的编译器：
/usr/local/python3/python3.8
9、建立python3和pip3的软连接
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
10、将/usr/local/python3/bin加入PATH
vim /etc/profile
加上这个
PATH=$PATH:$HOME/bin:/usr/local/python3/bin
export PATH
11、source ~/.bash_profile 让修改生效
12、python3 -V