I implemented get_filename() as specified in PEP 302 for importlib's source and bytecode loaders and I was starting to create the ABC for importlib.abc, but then I realized that perhaps the loader should live in runpy instead of importlib. Putting the new ABC in importlib keeps all PEP 302 ABCs in a single spot. But this addition to the PEP 302 protocols is very specific to runpy and is not directly required to make imports work (the implementation was just a reshuffling of pre-existing code from one method to another). I am tempted to leave the ABC out of importlib and stop at implementing get_filename() for importlib.abc.PyLoader and PyPycLoader.
Any opinions? -Brett
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