class FirstClass:
def setdata(self, value):
self.data = value
def display(self):
print self.data
x = FirstClass( )
y = FirstClass( )
x.setdata("A")
y.setdata(3.14159)
x.display( )
y.display( )
x.data = "New value"
x.display( )
x.anothername = "spam"