def __init__(self, sdat):
        """Initialization of instances:

        Args:
            sdat (:class:`StagyyData`): the StagyyData instance owning the
                :class:`_Steps` instance.
        Attributes:
            sdat (:class:`StagyyData`): the StagyyData instance owning the
                :class:`_Steps` instance.
        """
        self.sdat = sdat
        self._last = UNDETERMINED
        self._data = {None: _step.EmptyStep()}
def __init__ ( self , sdat ) : self . sdat = sdat self . _last = UNDETERMINED self . _data = { None : _step . EmptyStep ( ) }
Initialization of instances:

        Args:
            sdat (:class:`StagyyData`): the StagyyData instance owning the
                :class:`_Steps` instance.
        Attributes:
            sdat (:class:`StagyyData`): the StagyyData instance owning the
                :class:`_Steps` instance.