text: from collections import namedtuple
  Employee = namedtuple('Employee', 'name,age')
  e = Employee('Yamada',10)
  print(e._fields)            # view the field names
  
  Point = namedtuple('Point', ['x','y'])
  Color = namedtuple('Color', 'red green blue')
  Pixel = namedtuple('Pixel', Point._fields + Color._fields)
  print(Pixel(11, 22, 128, 255, 0))
  