After discovering my initial approach to PEP-402 style imports wasn't very robust, I implemented a better way of going about things but it later turned out that the recursive approach which importlib.__import__() employs is not well suited for virtual packages. Because of that, I ended up integrating P.J. Eby's (who is the author of PEP 402) iterative _gcd_import(). After a few minor changes it passes all unittests for importlib, but some details of virtual package imports still need to be worked out in the abstract before they can be implemented. In particular, it's not entirely clear if it's better to let virtual packages hang around should import of a module fail or should they be removed.
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