'Set value and display for hyperlinks in a cell.
Automatically sets the `value` of the cell with link text,
but you can modify it afterwards by setting the `value`
property, and the hyperlink will remain.'

@hyperlink.setter
def hyperlink(self, val):

    self._hyperlink = Hyperlink(ref=self.coordinate, target=val)
    self.parent.hyperlinks.add(self)
    if (self._value is None):
        self.value = val
