CentOS7 安装 Python 3.9.0

• 1. 安装编译相关工具
• 2. 创建 Python 文件夹下载安装包
• 3. 编译安装
• 4. 创建软连接
• 5. 验证
• 6. 脚本一键安装

• 安装开发库

yum -y groupinstall "Development tools"

• 安装依赖环境

yum -y install zlib zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

• 安装 libffi-devel

yum -y install libffi-devel

• 创建存放的文件夹

mkdir /usr/local/python3 

• 下载 Python3.9 安装包

cd /usr/local/python3
wget https://www.python.org/ftp/python/3.9.0/Python-3.9.0.tgz

• 解压

tar xf Python-3.9.0.tgz

• 进入 Python-3.9.0 文件夹

cd /usr/local/python3/Python-3.9.0

• 生成 makefile 文件

./configure prefix=/usr/local/python3 --with-ensurepip=install

• 编译安装

make -j 4 && make install

• 将原有 python2 链接备份

mv /usr/bin/python /usr/bin/python.bak

• 添加 python3 的软链接

ln -s /usr/local/python3/bin/python3.9 /usr/bin/python

• 查看 python 版本

python -V

• 更改 yum 脚本的 python 依赖，因为其要用到 python2 才能执行，否则会导致 yum 不能正常使用

vim /usr/bin/yum
原：#!/usr/bin/python 改：#!/usr/bin/python2

vim /usr/libexec/urlgrabber-ext-down
原：#! /usr/bin/python 改：#! /usr/bin/python2

• 检测 python2

python2

• 检测 python3

python

#!/bin/bash
echo -e "33[32m安装开发库,wait......33[0m"
yum -y groupinstall "Development tools" &> /dev/null
echo ' '
echo -e "33[32m安装依赖环境,wait......33[0m"
yum -y install zlib zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel wget &> /dev/null
echo ' '
echo -e "33[32m安装 libffi-devel,wait......33[0m"
yum -y install libffi-devel &> /dev/null
echo ' '
mkdir -p /usr/local/python3
echo -e "33[32m下载 python3.9.0 源码包,wait......33[0m"
wget http://101.34.22.188/python/Python-3.9.0.tgz -P /usr/local/python3 &> /dev/null
echo ' '
echo -e "33[32m解压源码包,wait......33[0m"
tar xf /usr/local/python3/Python-3.9.0.tgz -C /usr/local/python3 &> /dev/null
echo ' '
echo -e "33[32m编译安装,wait......33[0m"
cd /usr/local/python3/Python-3.9.0
./configure prefix=/usr/local/python3 --with-ensurepip=install &> /dev/null
sleep 5
make &> /dev/null
make install &> /dev/null
sleep 5
echo ' '
echo -e "33[32m创建软连接,wait......33[0m"
mv /usr/bin/python /usr/bin/python.bak
ln -s /usr/local/python3/bin/python3.9 /usr/bin/python
echo ' '
echo -e "33[32m更改 yum 脚本的 python 依赖,wait......33[0m"
sed -i 's/#!/usr/bin/python/#!/usr/bin/python2/' /usr/bin/yum
sed -i 's/#! /usr/bin/python/#! /usr/bin/python2/' /usr/libexec/urlgrabber-ext-down
echo ' '
echo -e "33[33mPython3.9.0 安装成功33[0m"
echo -e "33[32mPython3：python33[0m"
echo -e "33[32mPython2：python233[0m"