An example:

class Foo:
   def __init__(self):    # called when the object is created
      self.variable='hi!'

   def Print(self):
      print self.variable
# now we have a class defined, let's instantiate it and use it
bar=Foo()
bar.Print()
bar.variable='yo, sucka'
bar.Print()

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"Ignorance is its own reward" -- Proverb