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I don't have an idea how to make it easier and still meet all/most requirements and without cluttering up the api. The way it currently works allows the programmer to control every tiny aspect of a tar member. Maybe it's best to simply add a new entry to the Examples section of the tarfile documentation.
import tarfile, io
with tarfile.open("sample.tar", mode="w") as tar:
 t = tarfile.TarInfo("foo")
 t.type = tarfile.DIRTYPE
 tar.addfile(t)
 b = "Hello world!".encode("ascii")
 t = tarfile.TarInfo("foo/bar")
 t.size = len(b)
 tar.addfile(t, io.BytesIO(b))