1）安装devtoolset
yum groupinstall "Development tools"2） 安装编译Python需要的包
yum install zlib-devel
yum install bzip2-devel
yum install openssl-devel
yum install ncurses-devel
yum install sqlite-devel
3）下载并解压Python 2.7.9的源代码
cd /opt
wget --no-check-certificate https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tar.xz
tar xf Python-2.7.9.tar.xz
cd Python-2.7.9
4）编译与安装Python 2.7.9
./configure --prefix=/usr/local
make && make altinstall
5）配置软连接，让系统pyhon默认指向python2.7.9
mv /usr/bin/python /usr/bin/python2.6_temp
ln -s /usr/local/bin/python2.7 /usr/bin/python
python -V # 查看Python 2.7.9
6）yum与python2.7不兼容，修改yum文件
vi /usr/bin/yum
将"!/usr/bin/python"改为"!/usr/bin/python2.6"
7）配置环境变量
vi /etc/profile
# 添加如下内容：
PY_HOME=/usr/local/bin/python2.7
export PATH=$PY_HOME/bin:$PATH
8）启动环境变量配置
source /etc/profile # 当前终端生效，reboot后才会完全生效
echo $PATH #查看环境变量中是否包含python路径
9）完美升级完成