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class WeatherForecast (object):  def __init__ (self):    self.sky = None    self.high = None    self.low  = None  def set_skies (self, sky):    self.sky = sky  def set_high (self, high):    self.high = high  def set_low (self, low):    self.low = low  def get_skies (self):    return self.sky  def get_high(self):    return self.high  def get_low(self):    return self.low