Python3 枚举类型
枚举类型本身是一个类，枚举类型由单例模式实现，实例化无意义
注意：不允许两个标签的名称相同
若两个标签的对应值相同，则第二个标签为第一个标签的别名
from enum import Enum
class VIP(Enum): # 继承于Enum
YELLOW = 1
GREEN = 2
BLACK = 3
RED = 4
class VIP1(Enum):
YELLOW = 1
GREEN = 2
BLACK = 3
RED = 4
# 获取枚举类型
# print(VIP['GREEN'])
# 获取枚举的值
# print(VIP.YELLOW.value)
# 获取枚举的名字
# print(VIP.YELLOW.name)
# 枚举类型的比较 不可进行大小比较，可进行等值比较和is身份比较
# result = VIP.GREEN == VIP.BLACK
# print(result)
# result = VIP.GREEN is VIP.GREEN
# print(result)
# result = VIP.GREEN == VIP1.GREEN
# print(result)
# 使用数值访问枚举类型
a = 1
print(VIP(a))
# 枚举的遍历
for v in VIP:
print(v)
for v in VIP.__members__:
print(v)