安装python2.7

CentOS7上默认安装的是python2.7.5，在服务器上

首先安装epel扩展源：

yum -y install epel-release

然后安装python-pip

yum -y install python-pip

[root@localhost ~]# python --version
Python 2.7.5
[root@localhost ~]# pip --version
pip 8.1.2 from /usr/lib/python2.7/site-packages (python 2.7)

安装完之后别忘了清除一下cache

yum clean all

安装python3

在官方网站下载

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz

tar -zxvf Python-3.6.2.tgz
cd Python-3.6.2/
./configure --prefix=/usr/local
make
make install

Successfully installed pip-9.0.1 setuptools-28.8.0

[root@localhost Python-3.6.2]# python --version
Python 2.7.5
[root@localhost Python-3.6.2]# python3 --version
Python 3.6.2
[root@localhost Python-3.6.2]# pip --version
pip 8.1.2 from /usr/lib/python2.7/site-packages (python 2.7)
[root@localhost Python-3.6.2]# pip3 --version
pip 9.0.1 from /usr/local/lib/python3.6/site-packages (python 3.6)

在写Python代码的时候，文件头部都加上：

#!/usr/bin/env python3
# coding=utf-8