'Returns dict of { "dependency" => HDA }'

def get_converted_dataset_deps(self, trans, target_ext):

    try:
        depends_list = trans.app.datatypes_registry.converter_deps[self.extension][target_ext]
    except KeyError:
        depends_list = []
    return dict([(dep, self.get_converted_dataset(trans, dep)) for dep in depends_list])
