'Constructs a Polygon from a bounding box (4-tuple).'

@classmethod
def from_bbox(cls, bbox):

    (x0, y0, x1, y1) = bbox
    return GEOSGeometry(('POLYGON((%s    %s,    %s    %s,    %s    %s,    %s    %s,    %s    %s))' % (x0, y0, x0, y1, x1, y1, x1, y0, x0, y0)))
