code: def update_where(self, col, value, where_col_list, where_value_list):
          
          if type(col) is str:
              col_ndx = self.get_col_by_name(col)
          else:
              col_ndx = col
          #print('col_ndx = ', col_ndx    )
          #print("updating " + col + " to " , value, " where " , where_col_list , " = " , where_value_list)
          new_arr = self.select_where(where_col_list, where_value_list)
          #print('new_arr', new_arr)
          for r in new_arr:
              self.arr[r[0]][col_ndx] = value
docs: updates the array to set cell = value where col_list == val_list