old_contents: class BoltArray(object):
  
      _mode = None
  
      @property
      def mode(self):
          return self._mode
  
      @property
      def _constructor(self):
          return None
  
      def sum(self, axis):
          raise NotImplementedError
  
      def map(self, func):
          raise NotImplementedError
  
      def reduce(self, func):
          raise NotImplementedError
  
      def __repr__(self):
          s = "BoltArray\n"
          s += "mode: %s\n" % self._mode
          s += str(self)
          return s
new_contents: class BoltArray(object):
  
      _mode = None
      _metadata = ['_mode']
  
      @property
      def mode(self):
          return self._mode
  
      @property
      def _constructor(self):
          return None
  
      def __finalize__(self, other):
          if isinstance(other, BoltArray):
              for name in self._metadata:
                  otherAttr = getattr(other, name, None)
                  if (otherAttr is not None) and (getattr(self, name, None) is None):
                      object.__setattr__(self, name, otherAttr)
          return self
  
      def sum(self, axis):
          raise NotImplementedError
  
      def map(self, func):
          raise NotImplementedError
  
      def reduce(self, func):
          raise NotImplementedError
  
      def __repr__(self):
          s = "BoltArray\n"
          s += "mode: %s\n" % self._mode
          s += str(self)
          return s
subject: Add finalize