安装编译相关工具：
1.yum -y groupinstall "Development tools"
2.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
3.yum install libffi-devel -y
下载python安装包:
#下载页面上的安装包
wget https://www.python.org/ftp/python/3.8.3/Python-3.8.3.tgz
#解压压缩包
tar -zxvf Python-3.8.3.tgz
编译python:
#创建编译安装目录
mkdir /usr/local/python3
cd Python-3.8.3
# 配置安装位置
./configure --prefix=/usr/local/python3
make && make install
添加python3的软连接：
# 查看当前python软连接
ll /usr/bin/ |grep python
#删除原先的python2.7软连接和pip软连接
rm -rf /usr/bin/python
rm -rf /usr/bin/pip
#添加 python3 和 pip3 的软链接
ln -s /usr/local/python3/bin/python3 /usr/bin/python
ln -s /usr/local/python3/bin/pip3.8 /usr/bin/pip3
