Subclasses may override this method.

def _appendBPoint(self, type, anchor, bcpIn=None, bcpOut=None, **kwargs):
        """
        Subclasses may override this method.
        """
        self.insertBPoint(
            len(self.bPoints),
            type,
            anchor,
            bcpIn=bcpIn,
            bcpOut=bcpOut
        )