code: def transform(self):
          
          t_matrix = Matrix(self._rows, self._columns)
          for col_i, col in enumerate(self.matrix):
              for row_i, entry in enumerate(col):
                  t_matrix.set_value(row_i, col_i, entry)
          return t_matrix
docs: Return a new transformed matrix.
  
          :return:    Returns a new transformed Matrix
          :rtype:     Matrix