'Set the font stretch (horizontal condensation or expansion).
ACCEPTS: [a numeric value in range 0-1000 | \'ultra-condensed\' |
\'extra-condensed\' | \'condensed\' | \'semi-condensed\' |
\'normal\' | \'semi-expanded\' | \'expanded\' | \'extra-expanded\' |
\'ultra-expanded\' ]'

def set_stretch(self, stretch):

    self._fontproperties.set_stretch(stretch)
    self.stale = True
