下载

wgethttps://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

将系统默认的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依旧指向老的python2.6版本：

vi /usr/bin/yum

#!/usr/bin/python

第一行修改为

#!/usr/bin/python2.6.6