'Read/write |Length| value or |None|, indicating the font height in
English Metric Units (EMU). |None| indicates the font size should be
inherited from the style hierarchy. |Length| is a subclass of |int|
having properties for convenient conversion into points or other
length units. The :class:`docx.shared.Pt` class allows convenient
specification of point values::
>> font.size = Pt(24)
>> font.size
304800
>> font.size.pt
24.0'

@property
def size(self):

    rPr = self._element.rPr
    if (rPr is None):
        return None
    return rPr.sz_val
