The remove method of DLList of the Python version does not return values. The following is the snippet of the code.

   def remove(self, i):
        if i < 0 or i >= self.n: raise IndexError()
        self._remove(self.get_node(i))

The "remove" operation should return the removed values in this textbook. The same problem exists in the remove method of SEList of the Python version.