How can I do relative imports in Python?

Imagine this directory structure:

app/
   __init__.py
   sub1/
      __init__.py
      mod1.py
   sub2/
      __init__.py
      mod2.py

I'm coding mod1, and I need to import something from mod2. How should I do it?

I tried from ..sub2 import mod2, but I'm getting an "Attempted relative import in non-package".

I googled around, but I found only "sys.path manipulation" hacks. Isn't there a clean way?

All my __init__.py's are currently empty

I'm trying to do this because sub2 contains classes that are shared across sub packages (sub1, subX, etc.).

The behaviour I'm looking for is the same as described in PEP 366 (thanks John B).

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