Python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。
定义枚举类：
from enum import Enum, unique
@unique
class Weekday(Enum):
Sun = 0 # Sun的value被设定为0
Mon = 1
Tue = 2
Wed = 3
Thu = 4
Fri = 5
Sat = 6可以看到括号里面是Enum ，即继承自枚举类
然后给这个枚举类的每个成员赋予一个值
@unique装饰器可以帮助我们检查保证没有重复值。
使用：
>>> day1 = Weekday.Mon
>>> print(day1)
Weekday.Mon
>>> print(Weekday.Tue)
Weekday.Tue
>>> print(Weekday['Tue'])
Weekday.Tue
>>> print(Weekday.Tue.value)
2
>>> print(day1 == Weekday.Mon)
True
>>> print(day1 == Weekday.Tue)
False
>>> print(Weekday(1))
Weekday.Mon
>>> print(day1 == Weekday(1))
True
>>> Weekday(7)
Traceback (most recent call last):
...
ValueError: 7 is not a valid Weekday
>>> for name, member in Weekday.__members__.items():
... print(name, '=>', member)
...
Sun => Weekday.Sun
Mon => Weekday.Mon
Tue => Weekday.Tue
Wed => Weekday.Wed
Thu => Weekday.Thu
Fri => Weekday.Fri
Sat => Weekday.Sat本文参与?腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2018-10-22 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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