class color():
    YELLOW  = 1
    RED     = 2
    GREEN   = 3
    PINK    = 4
 
# 訪問枚舉項(xiàng)
print(color.YELLOW) # 1

class color():
    YELLOW  = 1
    YELLOW  = 3   # 注意這里又將YELLOW賦值為3，會(huì)覆蓋前面的1
    RED     = 2
    GREEN   = 3
    PINK    = 4
 
# 訪問枚舉項(xiàng)
print(color.YELLOW) # 3
 
# 但是可以在外部修改定義的枚舉項(xiàng)的值，這是不應(yīng)該發(fā)生的
color.YELLOW = 99
print(color.YELLOW) # 99

# 導(dǎo)入枚舉類
from enum import Enum
 
# 繼承枚舉類
class color(Enum):
    YELLOW  = 1
    BEOWN   = 1 
    # 注意BROWN的值和YELLOW的值相同，這是允許的，此時(shí)的BROWN相當(dāng)于YELLOW的別名
    RED     = 2
    GREEN   = 3
    PINK    = 4
 
class color2(Enum):
    YELLOW  = 1
    RED     = 2
    GREEN   = 3
    PINK    = 4

print(color.YELLOW) # color.YELLOW
print(type(color.YELLOW)) # <enum 'color'>
 
print(color.YELLOW.value)  # 1
print(type(color.YELLOW.value)) # <class 'int'>
 
print(color.YELLOW == 1)    # False
print(color.YELLOW.value == 1)  # True
print(color.YELLOW == color.YELLOW)  # True
print(color.YELLOW == color2.YELLOW)  # False
print(color.YELLOW is color2.YELLOW)  # False
print(color.YELLOW is color.YELLOW)  # True
 
print(color(1))         # color.YELLOW
print(type(color(1)))   # <enum 'color'>
　　注意事項(xiàng)如下：

color.YELLOW = 2  # Wrong, can't reassign member

from enum import IntEnum

from enum import Enum, unique