What problems can I have if I will use python 2.7 instead python 2.6 for my pylons/pyramid projects? Before I use python 2.6 on my ubuntu 10.04 but now I have ubuntu 11.04 on my laptop with python 2.7.
Take a look at http://docs.python.org/dev/whatsnew/2.7.html
You'll find what all you'll ever need to know.
python 2.6 vs 2.7, for pylons/pyramid projects