As root:
ln -sf /usr/bin/python2.6 /usr/local/bin/python
This will make a symbolic link from /usr/local/bin/python --> /usr/bin/python2.6(replacing the old hardlink).
As an alternative, you can also just add an alias for the command "python" in the your bash shell's startup file.
so open the startup file:emacs ~/.bashrc
in the editor u append:alias "python" "python2.6"
and restart the shell.
rm /usr/local/bin/pythonln -s /usr/local/bin/python2.6 /usr/local/bin/python