old_contents: class SpaceAge(object):
      def __init__(self):
          pass
  
new_contents: class SpaceAge(object):
      def __init__(self, seconds):
          self.seconds = seconds
  
      @property
      def years(self):
          return self.seconds/31557600
  
      def on_earth(self):
          return round(self.years, 2)
  
      def on_mercury(self):
          return round(self.years/0.2408467, 2)
  
      def on_venus(self):
          return round(self.years/0.6151976, 2)
  
      def on_mars(self):
          return round(self.years/1.8808158, 2)
  
      def on_jupiter(self):
          return round(self.years/11.862615, 2)
  
      def on_saturn(self):
          return round(self.years/29.447498, 2)
  
      def on_uranus(self):
          return round(self.years/84.016846, 2)
  
      def on_neptune(self):
          return round(self.years/164.79132, 2)
  
subject: Add initial solution