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>>> class FirstClass:
	def setdata(self, value):
		self.data = value
	def display(self):
		print self.data

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>>> x = FirstClass()
>>> y = FirstClass()

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>>> x.setdata('King Arthur')
>>> y.setdata(3.14159)

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>>> x.display()
King Arthur
>>> y.display()
3.14159

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>>> class SecondClass(FirstClass):
	def display(self):
		print 'Current value = "%s"' % self.data

>>> z = SecondClass()
>>> z.setdata(42)
>>> z.display()
Current value = "42"

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>>> class ThirdClass(SecondClass):
        def __init__(self, value):
            self.data = value
        def __add__(self, other):
            return ThirdClass(self.data + other)
        def __mul__(self, other):
            self.data = self.data * other

>>> a = ThirdClass("abc")
>>> a.display()
Current value = "abc"
>>> b = a + 'xyz'
>>> b.display()
Current value = "abcxyz"
>>> a * 3
>>> a.display()
Current value = "abcabcabc"

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>>> from set import Set
>>> a = Set([1,2,3])
>>> b = Set([2,3,4])
>>> a | b
Set:[1, 2, 3, 4]
>>> x = Set('hello')
>>> x
Set:['h', 'e', 'l', 'o']

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