def root_at_data(*leafs):
    return os.path.join(data_path(), *leafs)
https://familysearch.org/developers/docs/api/examples#places
dataset/ETHPy150Open FichteFoll/CSScheme/my_sublime_lib/path.py/root_at_data--crossover with--dataset/ETHPy150Open AmEv7Fam/familysearch-python-sdk-opensource/familysearch/places.py/Places.__init__