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__repr__ method should return a string that could be used as executable code to re-create the object

class adder:      def __init__(self, value=0):          self.data = value                          def __add__(self, other):          self.data += other                     class addboth(adder):      def __str__(self):          return '[Value: %s]' % self.data           def __repr__(self):          return 'addboth(%s)' % self.data       x = addboth(4)  print x                                        str(x), repr(x)