How do I write good/correct package __init__.py files

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My package has the following structure:

mobilescouter/
    __init__.py #1
    mapper/
        __init__.py  #2
        lxml/
            __init__.py #3
            vehiclemapper.py
            vehiclefeaturemapper.py
            vehiclefeaturesetmapper.py
        ...
        basemapper.py
   vehicle/
        __init__.py #4
        vehicle.py
        vehiclefeature.py
        vehiclefeaturemapper.py
   ...

I’m not sure how the __init__.py files should be correctly written.
The __init__.py #1 looks like:

__all__ = ['mapper', 'vehicle']
import mapper
import vehicle

But how should for example __init__.py #2 look like? Mine is:

__all__ = ['basemapper', 'lxml']
from basemaper import *
import lxml

When should be __all__ used?

3 Answers
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