I have installed python 3.3 and am trying to create a link from /usr/bin to where I have installed the new version. In the /usr/bin folder I find

python -> python2.7
python2 -> python2.7

Which are links to enable python to be run. Now I want to leave python2.7 where it is and create another link called python3 and point it to the location of the executable where my new install is. I have tried a few things like

ln -i python3 /home/berny/python/Python-3.3.0/debug/python

this did not work. Lost my python file so had to re-install, also tried

ln -s python3 /home/berny/python/Python-3.3.0/debug/python

but this did'nt work either

please advise. Thanks in advance