title: Python Class Setters Not Changing Variables
body: <p>The closest thread I could find to my problem was this: <a href="https://stackoverflow.com/questions/24534861/python-setter-does-not-change-variabe">Python setter does not change variable</a></p>
  
  <p>It didn't really help, the volume and the channels are not changing at all. The first fucntion which is to "watch TV" works perfectly fine.</p>
  
  <pre><code>class TV(object):
  
      def __init__(self, channel, volume):
          self.__channel = channel
          self.__volume = volume
  
      def __str__(self):
          out = ""
          out += "You're on channel #" + str(self.__channel) + ", " +     self.channelNetwork()
      out += "\nVolume is currently at: " + str(self.__volume) + "/20"
      return out
  
  # a method that determines the name for each channel from 1-10
  
  def channelNetwork(self):
      c = self.__channel
      if c == 1:
          return "CBS"
      elif c==2:
          return "NBC"
      elif c==3:
          return "ABC"
      elif c==4:
          return "Fox"
      elif c==5:
          return "ESPN"
      elif c==6:
          return "PBS"
      elif c==7:
          return "CNN"
      elif c==8:
          return "Comedy Central"
      elif c==9:
          return "Cartoon Network"
      elif c==10:
          return "Nicklodeon"
  
  # a volume slider that has a range from 0-20
  
  def volumeSlider(self, newVolume):
      v = self.__volume
      if newVolume == "+":
          v += 1
      else:
          v -= 1
      if v &lt; 0:
          v = 0
      if v &gt; 20:
          v = 20
  
  def channelChanger(self, newChannel):
      c = self.__channel
      if newChannel == "+":
          c += 1
      else:
          c -= 1
      if c &lt; 0:
          c = 0
      if c &gt; 10:
          c = 10
  
  def main():
  import random
  randomChannel = random.randint(1,10)
  randomVolume = random.randrange(21)
  televsion = TV(randomChannel, randomVolume)
  
  choice = None
  while choice != "0":
      print \
      ("""
      TV Simulator
  
      0 - Turn off TV
      1 - Watch TV
      2 - Change channel
      3 - Change volume
      """)
  
      choice = input("Choice: ")
      print()
  
      # exit
      if choice == "0":
          print("Have a good day! :)")
  
      elif choice == "1":
          print("You relax on your couch and watch some TV")
          print(televsion)
  
      elif choice == "2":
          newChannel = None
          while newChannel not in ('+', '-'):
              newChannel = input("\nPress '+' to go up a channel and press '-' to go down a channel: ")
          televsion.channelChanger(newChannel)
  
      elif choice == "3":
          newVolume = None
          while newVolume not in ('+', '-'):
              newVolume = input("\nPress '+' to increase volume and press '-' to decrease volume: ")
          televsion.volumeSlider(newVolume)
  
      else:
          print("\nSorry, but", choice, "isn't a valid choice.")
  
  main()
  input("\n\nPress enter to exit.")
  </code></pre>