Python3 与 Python2共存

  1. 查看当前python版本
python --version

  1. 备份python

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

  2. 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
  1. 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

  1. 查看python版本

    python --version

  2. 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