#!/bin/bash
echo "使用时将python的tar包放到/root/目录下"
read -p "此脚本需要联网,若是虚拟机,请将网络适配器改为nat模式" -t 2
echo
sed -i "s/BOOTPROTO=static/BOOTPROTO=dhcp/" /etc/sysconfig/network-ifcfg-ens33
ifdown ens33
ifup ens33
systemctl start network &>/dev/null
systemctl restart network &>/dev/null
if [ $"获取IP地址成功，地址为$ip"
else
echo "获取地址失败,请自行查看网络情况"
exit 1
fi
ping -c 3 www.baidu.com &>/dev/null
if [ $"网络连接成功,开始执行后续代码"
else
echo "网络连接失败,请查看地址是否可用"
exit 1
fi
cd /etc/yum.repos.d/
rm -rf *
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo &>/dev/null
yum clean all &>/dev/null
yum makecache &>/dev/null
yum install gcc patch libffi-devel python-devel zlib-devel bzip2-dnssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-4-devel libpcap-devel xz-devel -y &>/dev/null
echo "搭建国内yum源成功,正在开始安装python环境"
cd /root/
tar zxf Python-3.8.0a2.tgz &>/dev/null
cd Python-3.8.0a2/
./configure --prefix=/usr/local/python_3.8 &>/dev/null
if [ $"环境安装完成,正在配置python3.8"
else
echo "环境安装出错,请检查依赖包是否全部安装"
fi
make -j 4 &>/dev/null
make install &>/dev/null
ln -s /usr/local/python_3.8/bin/* /usr/bin/
echo "python3.8安装完成，位于/usr/local/python_3.8"

[root@test2 ~]# python3
Python 3.8.0a2 (default, Mar 29 2020, 19:45:00) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
Type "help", "copyright", "credits" or "license" for more information.
> print('hello')
hello
> #Ctrl+d退出