print("-------一、枚举类的使用----")

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

from enum import Enum

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

# 遍历枚举类型
for name, member in Month.__members__.items():
    print(name, '---------', member, '----------', member.value)

# 直接引用一个常量
print('\n', Month.Jan)

print("-------二、Enum 的源码----")
class EnumMeta(type):
    """Metaclass for Enum"""
    @property
    def __members__(cls):
        """Returns a mapping of member name->value.
        This mapping lists all enum members, including aliases. Note that this
        is a read-only view of the internal mapping.
        """
        return MappingProxyType(cls._member_map_)


print("-------三、自定义类型的枚举 ----")

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from enum import Enum, unique

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

# @unique 装饰器可以帮助我们检查保证没有重复值
@unique
class Month(Enum):
    Jan = 'January'
    Feb = 'February'
    Mar = 'March'
    Apr = 'April'
    May = 'May'
    Jun = 'June'
    Jul = 'July'
    Aug = 'August'
    Sep = 'September '
    Oct = 'October'
    Nov = 'November'
    Dec = 'December'

if __name__ == '__main__':
    print(Month.Jan, '----------',
          Month.Jan.name, '----------', Month.Jan.value)
    for name, member in Month.__members__.items():
        print(name, '----------', member, '----------', member.value)

print("-------四、枚举的比较----")

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from enum import Enum

class User(Enum):
    Twowater = 98
    Liangdianshui = 30
    Tom = 12

Twowater = User.Twowater
Liangdianshui = User.Liangdianshui

print(Twowater == Liangdianshui, Twowater == User.Twowater)
print(Twowater is Liangdianshui, Twowater is User.Twowater)

try:
    print('\n'.join('  ' + s.name for s in sorted(User)))
except TypeError as err:
    print(' Error : {}'.format(err))
    

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
import enum

class User(enum.IntEnum):
    Twowater = 98
    Liangdianshui = 30
    Tom = 12

try:
    print('\n'.join(s.name for s in sorted(User)))
except TypeError as err:
    print(' Error : {}'.format(err))