1.下载 python：
2.编译安装
sudo mkdir /usr/local/python27
sudo ./configure --prefix=/usr/local/python27
sudo make
sudo make install
3.升级连接版本
mv /usr/bin/python /usr/bin/python2.6.6
ln -s /usr/local/python27/bin/python /usr/bin/python
4.刷新
source /etc/profile
yum clean all
yum makecache