Scales all kerning values by **factor**. **factor** will be an
        :ref:`type-int-float`, ``tuple`` or ``list``. The first value of the
        **factor** will be used to scale the kerning values.

            >>> myKerning.scaleBy(2)
            >>> myKerning.scaleBy((2,3))

def scaleBy(self, factor):
        """
        Scales all kerning values by **factor**. **factor** will be an
        :ref:`type-int-float`, ``tuple`` or ``list``. The first value of the
        **factor** will be used to scale the kerning values.

            >>> myKerning.scaleBy(2)
            >>> myKerning.scaleBy((2,3))
        """
        factor = normalizers.normalizeTransformationScale(factor)
        self._scale(factor)