Is there a mechanism to check which objects have been loaded and which ones are still in the "lazy" state? Looking through the code and inspecting the objects returned by lazy.attach_stub it didn't see an obvious way to do so.

Maybe this could be addressed by making attach not return simple functions but objects. E.g.

__getattr__, __dir__, _ = lazy.attach_stub(__name__, __file__)
__getattr__.loaded_names  # return names which were already loaded

I think this would be very helpful in debugging and testing that lazy loading actually works as intended.

I'd be happy to work on this if there is interest!