python基础 -- 枚举Enum

1. 作用

列举常量，例如月份，周数

2. 操作

from enum import Enum, unique

Month = Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 
    'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))

@unique # 检查是否具有重复值
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

if __name__ == '__main__':
    day1 = Weekday.Mon
    print(day1)
    day2 = Weekday['Tue']
    print(day2)
    day3 = Weekday.Wed.value
    print(day3)
    for name, member in Weekday.__members__.items():
        print('{} => {}.'.format(name, member))

    for name, member in Month.__members__.items():
        print('{} => {}.'.format(name, member))