I would almost guarantee you have more than one python installed on BT. You can use
whereis to confirm.
root@bt:~# whereis python
python: /usr/bin/python2.5 /usr/bin/python /usr/bin/python2.5-config /usr/bin/python2.4 /etc/python2.5 /etc/python /etc/python2.4 /usr/lib/python2.5 /usr/lib/python2.4 /usr/local/lib/python2.5 /usr/local/lib/python2.4 /usr/include/python2.5 /usr/include/python2.5_d /usr/include/python2.4 /usr/include/python2.4_d /usr/share/python /usr/share/man/man1/python.1.gz
It could be pointing to another version also in
Best bet: to test, you could delete/move older versions of python from the directory. Or you can use this video to run an Update Everything script. That will cover your ground.