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To make using importlib.find_loader() easier, there should be a flag that says to automatically import all parent packages for the desired submodule so as to not force the user to do it::
 def find_loader(name, path=None, *, load_parents=False): ...
That way people who are okay with loading some packages implicitly to get at a specific loader can do so without having to do boilerplate name.split('.'); import each parent code. Also means people don't have to worry about the path argument (unless they explicitly want to trigger loading from a different location).