Python3 与 Python2共存

查看当前python版本

python --version

备份python

which pythonmv /usr/bin/python /usr/bin/python.bak

下载安装更新python3

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xztar -xvJf Python-3.6.2.tar.xz

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 makecd Python-3.6.2./configure prefix=/usr/local/python3make && make installln -s /usr/local/python3/bin/python3 /usr/bin/python

查看python版本

python --version

修改相关执行程序python版本

vi /usr/bin/yum把#! /usr/bin/python修改为#! /usr/bin/python2vi /usr/libexec/urlgrabber-ext-down 文件里面的#! /usr/bin/python 也要修改为#! /usr/bin/python2