Question

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?

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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).

Answer 1

The problem is that you’re running the module as ‘__main__’ by passing the mod1.py as an argument to the interpreter.

From PEP 328:

Relative imports use a module’s __name__ attribute to determine that module’s position in the package hierarchy. If the module’s name does not contain any package information (e.g. it is set to ‘__main__’) then relative imports are resolved as if the module were a top level module, regardless of where the module is actually located on the file system.

In Python 2.6, they’re adding the ability to reference modules relative to the main module. PEP 366 describes the change.