text: from enum import Enum, unique
  
  Month = Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))
  
  # value属性则是自动赋给成员的int常量，默认从1开始计数
  for name, member in Month.__members__.items():
      print(name, '=>', member, ',', member.value)
  
  print(Month.Jan.value)
  
  
  @unique
  # @unique装饰器可以帮助我们检查保证没有重复值
  class Weekday(Enum):
      Sun = 0
      Mon = 1
      Tue = 2
      Wed = 3
      Thu = 4
      Fri = 5
      Sat = 6
      # AAA = 6
  
  print(Weekday['Sun'])
  print(Weekday(1))
  print(Weekday.Mon)
  