install python26 in centos and replace the old version(2.4)

install_python26.sh

#python26#
wget http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
sudo rpm -ivh epel-release-5-4.noarch.rpm
yum -y install python26
ln -f /usr/bin/python2.6 /usr/bin/python
python -V

#EOF python26

#For python2.7#
yum install -y bzip2*
cd /root/src
wget http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz
tar zvxf Python-2.7.3.tgz
cd Python-2.7.3
./configure
make && make install

mv /usr/bin/python  /usr/bin/python.bak
ln -s /usr/local/bin/python2.7 /usr/bin/python
python -V    #check soft link

#python3
wget https://www.python.org/ftp/python/3.4.2/Python-3.4.2.tgz
tar zxvf Python-3.4.2.tgz
cd Python-3.4.2
./configure --prefix=/usr/local/python342
make
make install

#ISSUE
#解决系统python软链接指向python2.7版本后，yum不能正常工作
$vi /usr/bin/yum
#将文本编辑显示的#/usr/bin/python修改为#/usr/bin/python2.4，保存修改即可。

wget --no-check-certificate http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz