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Enum类  2018/8/12 

1.应用：定义常量时value属性则是自动赋给成员的int常量，默认从1开始计数from enum import EnumMonth = Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun','Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))type(Month),type(Month.Jan)#(enum.EnumMeta, 
   
    ) 属性：Month.Feb.name#'Feb'Month.Feb.value#2
   

for name, member in Month.__members__.items():print(name, '=>', member, ',', member.value)#输出见备注1for i in Month:print(i,i.name,i.value) #输出见备注1

2.精确地控制枚举类型从Enum派生出自定义类：from enum import Enum, unique@unique #检查保证没有重复值class Weekday(Enum):Sun = 0 # Sun的value被设定为0Mon = 1Tue = 2Wed = 3Thu = 4Fri = 5Sat = 6 

属性：day1.name# 'Mon'day1.value#1day1.Sun.name# 'Sun'day1.Sun.value#0访问枚举类型：day1 = Weekday.Mon #
   
    print(Weekday.Tue) #Weekday.Tueprint(Weekday['Tue']) #Weekday.Tueprint(Weekday.Tue.value) #2print(Weekday(1)) #Weekday.Mon    
   

备注1：

输出：

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