code: def scale(reader, writer, column, start, stop, multiple):
    
    for i, row in enumerate(reader):
      if i >= start and i <= stop:
        row[column] = type(multiple)(row[column]) * multiple
      writer.appendRecord(row)
docs: Multiplies a value over a range of rows.
  
    Args:
      reader: A FileRecordStream object with input data.
      writer: A FileRecordStream  object to write output data to.
      column: The column of data to modify.
      start: The first row in the range to modify.
      end: The last row in the range to modify.
      multiple: The value to scale/multiply by.