How to use the h5pyd._hl.base.HLObject.__init__ function in h5pyd

def __init__(self, bind):
        """ Create a new Dataset object by binding to a low-level DatasetID.
        """

        if not isinstance(bind, DatasetID):
            raise ValueError("%s is not a DatasetID" % bind)
        HLObject.__init__(self, bind)

        self._dcpl = self.id.dcpl_json
        self._filters = filters.get_filters(self._dcpl)

        self._local = None  # local()

        # make a numpy dtype out of the type json
        self._dtype = createDataType(self.id.type_json)
        self._item_size = getItemSize(self.id.type_json)

        self._shape = self.get_shape()

        self._num_chunks = None  # aditional state we'll get when requested
        self._allocated_size = None # as above
        self._verboseUpdated = None # when the verbose data was fetched

def __init__(self, bind):
        """ Create a new Datatype object by binding to a low-level TypeID.
        """
        if not isinstance(bind, TypeID):
            # todo: distinguish type from other hl objects
            raise ValueError("%s is not a TypeID" % bind)
        HLObject.__init__(self, bind)

        self._dtype = createDataType(self.id.type_json)
        self._req_prefix = "/datatypes/" + self.id.uuid

def __init__(self, bind, **kwargs):
        #print "group init, bind:", bind

        """ Create a new Group object by binding to a low-level GroupID.
        """

        if not isinstance(bind, GroupID):
            raise ValueError("%s is not a GroupID" % bind)
        HLObject.__init__(self, bind, **kwargs)
        self._req_prefix = "/groups/" + self.id.uuid
        self._link_db = {}  # cache for links