Absolute vs. explicit relative import of Python module

I'm wondering about the preferred way to import packages in a Python application. I have a package structure like this:

project.app1.models
project.app1.views
project.app2.models

project.app1.views imports project.app1.models and project.app2.models. There are two ways to do this that come to mind.

With absolute imports:

import A.A
import A.B.B

or with explicit relative imports, as introduced in Python 2.5 with PEP 328:

# explicit relative
from .. import A
from . import B

What is the most pythonic way to do this?