下載
wget https://www.python.org/ftp/python/2.7.12/Python-2.7.12.tgz
tar xvf Python-2.7.12.tar
mkdir /usr/local/python2.7.12
yum install zlib zlib-devel
yum install gcc
./configure --prefix=/usr/local/python2.7.12
make && make install
將系統默認的python指向到2.7版本
mv /usr/bin/python /usr/bin/python2.6.6
ln -s /usr/local/python2.7.12/bin/python /usr/bin/python
把yum依舊指向老的python2.6版本：
vi /usr/bin/yum
#!/usr/bin/python
第一行修改爲
#!/usr/bin/python2.6.6