#!/usr/bin/python3

# -*- coding: utf-8 -*-

# @Time    : 2018/6/15 14:47

# @File    : enum_demo1.py

from enum import Enum, unique

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

@unique  # 如果要限制定义枚举时，不能定义相同值的成员。可以使用装饰器@unique【要导入unique模块】 Sat1 = 6 会报错

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

    # Sat1 = 6

for name, member in Month.__members__.items():

    print(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

for i in Weekday.__members__.items():

    print(i, type(i))

# ('Sun', <Weekday.Sun: 0>) <class 'tuple'>

# ('Mon', <Weekday.Mon: 1>) <class 'tuple'>

# ('Tue', <Weekday.Tue: 2>) <class 'tuple'>

# ('Wed', <Weekday.Wed: 3>) <class 'tuple'>

# ('Thu', <Weekday.Thu: 4>) <class 'tuple'>

# ('Fri', <Weekday.Fri: 5>) <class 'tuple'>

# ('Sat', <Weekday.Sat: 6>) <class 'tuple'>

# 1.1 定义枚举时，成员名称不允许重复

# 1.2 默认情况下，不同的成员值允许相同。但是两个相同值的成员，第二个成员的名称被视作第一个成员的别名

# 1.3 如果枚举中存在相同值的成员，在通过值获取枚举成员时，只能获取到第一个成员

for i in Weekday:

    print(i, end=' ')

print()

# Weekday.Sun Weekday.Mon Weekday.Tue Weekday.Wed Weekday.Thu Weekday.Fri Weekday.Sat(Sat1 = 6 不显示)

# 2. 枚举取值

# 2.1 通过成员的名称来获取成员

print('Weekday[\'Sun\']---------', Weekday['Sun'])

# Weekday['Sun']--------- Weekday.Sun

# 2.2 通过成员值来获取成员

print('Weekday(2)---------', Weekday(2))

# Weekday(2)--------- Weekday.Tue

# 2.3 通过成员，来获取它的名称和值

we = Weekday.Sun

print('we.name, we.value------------', we.name, we.value)

# we.name, we.value------------ Sun 0

# 3. 迭代器

# 3.1 枚举支持迭代器，可以遍历枚举成员

for i in Weekday:

    print(i, type(i))

# Weekday.Sun <enum 'Weekday'>

# Weekday.Mon <enum 'Weekday'>

# Weekday.Tue <enum 'Weekday'>

# Weekday.Wed <enum 'Weekday'>

# Weekday.Thu <enum 'Weekday'>

# Weekday.Fri <enum 'Weekday'>

# Weekday.Sat <enum 'Weekday'>

# 3.2 如果枚举有值重复的成员，循环遍历枚举时只获取值重复成员的第一个成员

class Color(Enum):

    red = 1

    orange = 2

    yellow = 3

    green = 4

    blue = 5

    indigo = 6

    purple = 7

    red_alias = 1

for color in Color:

    print(color)

# Color.red

# Color.orange

# Color.yellow

# Color.green

# Color.blue

# Color.indigo

# Color.purple

# 3.3 如果想把值重复的成员也遍历出来，要用枚举的一个特殊属性__members__

class Color(Enum):

    red = 1

    orange = 2

    yellow = 3

    green = 4

    blue = 5

    indigo = 6

    purple = 7

    red_alias = 1

for color in Color.__members__.items():

    print(color)

# ('red', <Color.red: 1>)

# ('orange', <Color.orange: 2>)

# ('yellow', <Color.yellow: 3>)

# ('green', <Color.green: 4>)

# ('blue', <Color.blue: 5>)

# ('indigo', <Color.indigo: 6>)

# ('purple', <Color.purple: 7>)

# ('red_alias', <Color.red: 1>)

# 4 枚举比较

# 4.1 枚举成员可进行同一性比较

print(Weekday.Sun is Weekday.Sun)  # True

# 4.2 枚举成员可进等值比较

print(Weekday.Sun == Weekday.Sun)  # True

# 4.3 枚举成员不能进行大小比较

# print(Weekday.Sun > Weekday.Sun)

# TypeError: '>' not supported between instances of 'Weekday' and 'Weekday'

'''

枚举取值 总结:

通过成员的名称来获取成员;通过成员值来获取成员;通过成员，来获取它的名称和值.

注意: Enum 的成员均为单例（Singleton），并且不可实例化，不可更改.

枚举是可以比较的:

举成员可进行同一性比较,可进等值比较,不能进行大小比较.

总结: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,并且枚举有多种实现方法。

'''