centos7系统 shell脚本安装python3 各版本

#!/bin/bash
#author: HAITAO
# for python3 to centos7
while true
do
  echo "想要安装的python版本：" && read version
  if [  -n  "$version"  ];then
  break
  else
    echo "无输入版本，默认3.8.5!等待5s,自动开始安装，退出请按Ctrl+C !!!"
    sleep 5
  version=3.8.5
  break
  fi
done
python3 --version> /dev/null 2>&1
if [ $? -ne 0 ]
then
    echo "开始安装Python$version"
    #安装依赖
    yum install wget zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel -y
    #下载安装包并解压
    wget https://www.python.org/ftp/python/$version/Python-$version.tgz
    tar -zxvf Python-$version.tgz
    cd Python-$version
    # 配置安装位置
    ./configure prefix=/usr/local/python3
    # 安装
    make && make install
    #添加python3的软链接
    ln -s /usr/local/python3/bin/python3.$(echo $version|cut -d '.' -f2) /usr/bin/python3
    #添加 pip3 的软链接
    ln -s /usr/local/python3/bin/pip3.$(echo $version|cut -d '.' -f2) /usr/bin/pip3
    python3 --version> /dev/null 2>&1
    if [ $? -ne 0 ]
    then
        echo "安装失败"
    else
        echo "安装成功"
    fi
else
    echo "已有python3版本:$(python3 --version),无需再安装python3，如果需要请手动安装"
fi