升级安装Python3

创建安装目录

[root@myprecious opt]# mkdir /usr/local/python3

下载Python3

[root@myprecious opt]# wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tar.xz

编译安装

[root@myprecious opt]# tar xf Python-3.6.4.tar.xz && cd Python-3.6.4
[root@myprecious Python-3.6.4]# ./configure --prefix=/usr/local/python3
[root@myprecious Python-3.6.4]# make
[root@myprecious Python-3.6.4]# make install

更改链接使Python2/3两版本共存

[root@myprecious Python-3.6.4]# mv /usr/bin/python{,_bak}
[root@myprecious Python-3.6.4]# mv /usr/bin/pip{,_bak}
[root@myprecious Python-3.6.4]# ln -s /usr/local/python3/bin/python3 /usr/bin/python
[root@myprecious Python-3.6.4]# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip

使常用工具继续使用python2.7版本

[root@myprecious Python-3.6.4]# sed -i 's@#!/usr/bin/python@#!/usr/bin/python2.7@' /usr/bin/yum
[root@myprecious Python-3.6.4]# sed -i 's@#!/usr/bin/python@#!/usr/bin/python2.7@' /usr/libexec/urlgrabber-ext-down

注：以后碰到其他由python写的工具不能正常工作时也可以先尝试此操作，比如supervisor。

验证python及pip版本

[root@myprecious install]# python -V
Python 3.6.4
[root@myprecious install]# pip -V
pip 9.0.1 from /usr/local/python3/lib/python3.6/site-packages (python 3.6)

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