Too many python installations. Should i remove them all and install the latest?

[Νικόλαος Κούρας]

root at nikos [~]# which python
/usr/bin/python
root at nikos [~]# which python2
/usr/bin/python2
root at nikos [~]# which python3
/root/.local/lib/python2.7/bin/python3
root at nikos [~]# which python3.3
/root/.local/lib/python2.7/bin/python3.3
root at nikos [~]# 

So i have
2.6
2.7
3
3.3 

4 installations?