今天心血来潮，Virtual Box安装了CentOS 7.8 最新min版，安装完后，除了设置最新的网卡设置外，

vi /etc/sysconfig/network-scripts/ifcfg-e***根据你的网卡类型，修改ONBOOT=yes

使用yum install net-tools，

剩下的就是卸载python2.7了，结果一卸载就知道掉坑了，请看这篇文章描述

坑-centOS7.2--》重装 python2.7和yum！（原因误删了python后，yum不能用了）

https://www.cnblogs.com/mjbenkyo/p/12556255.html

按照上面的文章操作，还不能重新安装CentOS7.8。为了python2和python3共存，发现可以使用python和python3共存，Python3安装步骤（使用sudo 到root安装）

安装过程如下

--------------------------------------------------------------------------------------------------------------------------------------------------------------

yum -y groupinstall "Development tools"
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
yum install libffi-devel -y
下载并解压安装包
cd 你自己的目录
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.8.tar.xz
tar -xvJf  Python-3.7.8.tar.xz
编译及安装
mkdir /usr/local/python3 #创建编译安装目录
cd Python-3.7.8
./configure --prefix=/usr/local/python3
make && make install
创建软连接
ln -s /usr/local/python3/bin/python3 /usr/local/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/local/bin/pip3
验证

python3 -V
pip3 -V

--------------------------------------------------------------------------------------------------------------------------------------------------------------