2，python3 的linux 安装脚本

vim a.sh
#! /bin/bash
yum -y install zlib-devel bzip2-devel libffi-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel wget gcc 
#wget https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz
mkdir -p /usr/local/python3
tar -xf Python-3.7.0.tgz
yum install libffi-devel -y
cd Python-3.7.0
pwd
./configure --prefix=/usr/local/python3
make 
make install
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
echo 'PATH=$PATH:$HOME/bin:/usr/local/python3/bin' >>/etc/profile
echo 'export PATH' >>/etc/profile
source /etc/profile