I've been using pycharm 2.7 with several web2py projects.
I've upgraded to pycharm v3 (professional) and reopened a web2py project. I see no evidence that it has recognised a web2py project. Actually, I don't know where I would see that if it was true, but nothing seems different and there is no indication in project prefs. So I then deleted the .idea folder in the project root, and reopened it, but I still don't see any recognition of it as a web2py project.
It's web2py 2.6.4, the latest one.