import dbm.dumb
import pathlib
import tempfile

with tempfile.TemporaryDirectory() as tmpdir:
    path = pathlib.Path(tmpdir) / "database"

    with dbm.dumb.open(path, "n") as db:
        db[b"deleted"] = b"x"
        db[b"retained"] = b"value"
        del db[b"deleted"]

        db.reorganize()
        print("before reopening:", db[b"retained"])

    with dbm.dumb.open(path, "r") as db:
        print("after reopening: ", db[b"retained"])
        assert db[b"retained"] == b"value"