GeezerVison

Please add a unittest and document.

Also add to 3.14 what's new(recommend)

One of the tests is currently failing because you also need to add the new test folder to the Makefile:

should be:

  test/test_inspect \
+ test/test_inspect/inspect_simple_pkg \

LGTM

@brettcannon @ncoghlan: Is it the correct way to check if a module a package, ismodule(object) and hasattr(object, "__path__")?

I'm not sure __path__ is mandatory anymore, as I believe it's just a way to override __spec__. I'll double check the importlib code.

Edit: after checking the importlib code, I'm happy simply looking for __path__ is still the right check for runtime introspection. importlib itself handles merging __path__, __spec__.is_package and __spec__.submodule_search_locations into a single final __path__ list when it creates the import package module instances.

This also keeps things consistent with the glossary's definition of a package as a module with a __path__ attribute.

Thanks for the PR @Xiaokang2022, and thanks for the prior reviews all!