'Set the worksheet zoom factor.
Args:
zoom: Scale factor: 10 <= zoom <= 400.
Returns:
Nothing.'

def set_zoom(self, zoom=100):

    if ((zoom < 10) or (zoom > 400)):
        warn(('Zoom    factor    %d    outside    range:    10    <=    zoom    <=    400' % zoom))
        zoom = 100
    self.zoom = int(zoom)
