python2.7.X 升级至Python36.X

安装Python3

项目是在py3环境下进行编码的，正好Centos默认的py版本是2，我们还需要安装py3才能让程序run起来，在此之前，需要安装开发工具包，因为要编译安装Python
[root@CentOS ~]# yum -y group install "Development Tools"

安装Python的依赖包，不安装依赖可能安装完成后没有pip3 软件。
[root@CentOS ~]# yum -y install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel vim

下载目前最新的Python3.5.x
[root@CentOS ~]# wget https://www.python.org/ftp/python/3.5.3/Python-3.5.3.tgz
可能你需要通过yum -y install wget

解压编译安装
[root@CentOS ~]# tar xf Python-3.5.3.tgz
[root@CentOS ~]# cd Python-3.5.3
[root@CentOS Python-3.5.3]# ./configure --prefix=/usr/local/python3.5
[root@CentOS Python-3.5.3]# make
[root@CentOS Python-3.5.3]# make altinstall

为pip3和python3创建链接
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/python3 /usr/local/bin/
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/pip3 /usr/local/bin/
[root@CentOS Python-3.5.3]# mv /usr/bin/python/usr/bin/python_old
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/python3.5 /usr/bin/python
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/pip3.5 /usr/bin/pip

验证安装
[root@CentOS Python-3.5.3]# pip -V
pip 9.0.1 from /usr/local/python3.5/lib/python3.5/site-packages (python 3.5)
[root@CentOS Python-3.5.3]# python -V
Python 3.5.3

修改yum文件，否则yum将无法下载
vim /usr/bin/yum
将#!/usr/bin/python修改为#!/usr/bin/python2.7保存即可生效

python2.7.X 升级至Python3.6.X