Python -- OOP高级 -- 枚举类

Enum可以把一组相关常量定义在一个class中，且class不可变，而且成员可以直接比较。

from enum import Enum

Month = Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 
                        'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))
                        
for name, member in Month.__members__.items():
    print("%s => %s, %d" % (name, member, member.value))

>>> 
Jan => Month.Jan, 1
Feb => Month.Feb, 2
Mar => Month.Mar, 3
Apr => Month.Apr, 4
May => Month.May, 5
Jun => Month.Jun, 6
Jul => Month.Jul, 7
Aug => Month.Aug, 8
Sep => Month.Sep, 9
Oct => Month.Oct, 10
Nov => Month.Nov, 11
Dec => Month.Dec, 12

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