My friend and I are planning on building a sort of a forum type of webapp.
We've used the major PHP frameworks but we're really thinking about using Python specifically the Pylons framework for our app. Although we're competent PHP programmers, we're somewhat noobs at Python (We could create practical scripts and such). But the thing is we really want to learn Python but by testing Pylons out it seems to be really difficult with all the numerous imports and all.
What would you suggest? What advice could you give to us? How would you suggest that we learn Pylons?
Don't be scared off by imports in python.  They're much more common when coding in python than PHP in general, and this is good because your namespace never gets polluted with stuff you aren't expecting, unless you do from foo import * (so don't do that).  I think you'll find that the structure pylons gives you will be invaluable.  There are frameworks in PHP as well, but if you want to learn python anyway, I see no reason you shouldn't dive in with Pylons.
Should we use Pylons or PHP for our webapp?