Current state of python namespace packages

I would like to have several python sub modules inside a main module, but I want to distribute them as separated python packages. So package A should provide 'my_data.source_a', package B should provide 'my_data.source_b', ... and so on.

I found out that I have to use a namespace package for this, but trying to figuring out the details, I found multiple PEPs covering that problem. PEP 420 seems to be the latest one, which builds upon PEP 402 and PEP 382.

To me it's not clear what the status of the different PEPs an implementations is. So my question is: Is http://pythonhosted.org/distribute/setuptools.html#namespace-packages still the way to go or how should I build my namespace package?

from Current state of python namespace packages