docs: def select_char_code_table(self, table):
          '''Select character code table, from tree built in ones.
          
          Args:
              table: The desired character code table. Choose from 'standard', 'eastern european', 'western european', and 'spare'
          Returns:
              None
          Raises:
              RuntimeError: Invalid chartable.
          '''
          tables = {'standard': 0,
                    'eastern european': 1,
                    'western european': 2,
                    'spare': 3
                    }
          if table in tables:
              self.send(chr(27)+'t'+chr(tables[table]))
          else:
              raise RuntimeError('Invalid char table.')