centos7系统python3安装部署

1、依赖环境安装

yum install -y wget lrzsz net-tools zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make
yum install libffi-devel -y

2、查询python2版本路径并备份

whereis python
mv /usr/bin/python /usr/bin/python2

3、python3.9源码安装

cd /usr/local
wget https://www.python.org/ftp/python/3.9.1/Python-3.9.1.tgz
mkdir python3.9
cd /usr/bin
cd Python-3.9.1/
./configure --prefix=/usr/local/python3.9
make
make install

4、python3创建软连接

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

5、python加入PATH环境变量

vim /etc/profile

  export PATH=/usr/local/python3.9:$PATH

source /etc/profile

6、解决yum不能用的问题

vim /usr/bin/yum

vim /usr/libexec/urlgrabber-ext-down

将#!/usr/bin/python改成#!/usr/bin/python2

6、安装pip3

yum -y install python3-pip

7、卸载Python3

 1）卸载python3

 rpm -qa|grep python3|xargs rpm -ev --allmatches --nodeps

2）删除所有残余文件

whereis python3 |xargs rm -frv 
成功卸载！

3）whereis python 查看现有安装的python