class Radio():
  def init(self):
    self._powerOn = False
    self._volume = 5
    self._station = 90.7
    self._presets = [ 90.7, 92.3, 94.7, 98.1, 105.7, 107.7 ]

  def togglePower(self):
    self._powerOn = not self._powerOn

  def setPreset(self, ind):
      self._presets[ind] = _station

  def gotoPreset(self, ind):
    self._station = self._presets[ind]

 def increaseVolume(self):
   self._volume = self._volume + 1

  def decreaseVolume(self):
    self._volume = self._volume - 1

  def increaseStation(self)
    self._station = self._station + .2

  def decreaseStation(self):
    self._station = self._station - .2