class FirstClass:
def setdata(self, value):
self.data = value
def display(self):
print self.data
class SecondClass(FirstClass):
def display(self):
print 'Current value = "%s"' % self.data
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( )
b = a + 'xyz'
b.display( )
a * 3
a.display( )