Holger and I had a conversation about virtual namespaces on IRC.
We're using this to have a common namespace for plugins*, and Holger
expressed interest in using this approach as well.
The goal is to use a common package name (here: "foo") for multiple
independent modules or packages ("alpha" and "bravo" - to be accessed as
foo.alpha and foo.bravo, respectively).
It's actually rather simple:
The individual components must be contained in a directory named after
the virtual namespace, with an __init__.py containing nothing but the
following statement:
__import__("pkg_resources").declare_namespace(__name__)
To make Python aware of the local package (e.g. for running tests out of
the repository), something like the following is required in a
root-level __init__.py:
path = os.path.abspath(VIRTUAL_NAMESPACE)
sys.modules[VIRTUAL_NAMESPACE].__dict__["__path__"].insert(0, path)
This is illustrated here:
http://gist.github.com/231862
Disclaimer: I'm far from being an expert, just sharing what we've
learned so far (it's an ongoing effort).
-- F.
*
http://cdent.tumblr.com/post/216241761/python-namespace-packages-for-tiddlyweb
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