text: class TheThing(object):
  
  	def __init__(self):
  		self.number = 0
  
  	def some_function(self):
  		print "I got called."
  
  	def add_me_up(self, more):
  		self.number += more
  		return self.number
  
  # two different things
  
  a = TheThing()
  b = TheThing()
  
  a.some_function()
  b.some_function()
  
  print a.add_me_up(20)
  print a.add_me_up(20)
  print b.add_me_up(30)
  print b.add_me_up(30)
  
  print a.number
  print b.number