|float| or |Length| value specifying the space between baselines in
        successive lines of the paragraph. A value of |None| indicates line
        spacing is inherited from the style hierarchy. A float value, e.g.
        ``2.0`` or ``1.75``, indicates spacing is applied in multiples of
        line heights. A |Length| value such as ``Pt(12)`` indicates spacing
        is a fixed height. The |Pt| value class is a convenient way to apply
        line spacing in units of points. Assigning |None| resets line spacing
        to inherit from the style hierarchy.

def line_spacing(self):
        """
        |float| or |Length| value specifying the space between baselines in
        successive lines of the paragraph. A value of |None| indicates line
        spacing is inherited from the style hierarchy. A float value, e.g.
        ``2.0`` or ``1.75``, indicates spacing is applied in multiples of
        line heights. A |Length| value such as ``Pt(12)`` indicates spacing
        is a fixed height. The |Pt| value class is a convenient way to apply
        line spacing in units of points. Assigning |None| resets line spacing
        to inherit from the style hierarchy.
        """
        pPr = self._element.pPr
        if pPr is None:
            return None
        return self._line_spacing(pPr.spacing_line, pPr.spacing_lineRule)