python_select is deprecated (in MacPorts)
After some head banging with MacPorts in order to try to install python_select, I’ve found an explanation why python_select, although being displayed as being installed and active by MacPorts, still does not get installed in /opt/local/bin (and therefore, it borks when trying to run it from the command line): #29531 (_select ports no longer provide _select binary) – MacPorts.
So now it seems that python_select was deprecated and we should use instead (e.g. to select python2.6):
% sudo port select python python26