def __init__(self, cfg, src_db, dest_db):
self.__cfg = cfg<EOL>self._logger = logging.getLogger(__class__.__name__)<EOL>self._src_db = src_db<EOL>self._dest_db = dest_db<EOL>self._transformation = self.__cfg[<EOL>Transformation.__CFG_KEY_TRANSFORMATION] if Transformation.__CFG_KEY_TRANSFORMATION in self.__cfg else None<EOL>
Constructor
:param cfg: transformation configuration
:param src_db: source db for transformation
:param dest_db: destination db for transformation