Python3 与 Python2共存

Python3 与 Python2共存

1. 查看当前python版本 python --version
2. 备份python which python mv /usr/bin/python /usr/bin/python.bak
3. 下载安装更新python3 wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz tar -xvJf Python-3.6.2.tar.xz
4. 安装关联程序，安装编译python3 yum install -y zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make cd Python-3.6.2 ./configure prefix=/usr/local/python3 make && make install ln -s /usr/local/python3/bin/python3 /usr/bin/python
5. 查看python版本 python --version
6. 修改相关执行程序python版本 vi /usr/bin/yum 把#! /usr/bin/python修改为#! /usr/bin/python2 vi /usr/libexec/urlgrabber-ext-down 文件里面的#! /usr/bin/python 也要修改为#! /usr/bin/python2