```py
from enum import Enum
# 定義一個枚舉類型
class Color(Enum):
RED = 1
GREEN = 2
BLUE = 3
# 使用枚舉值
print(Color.RED) # 輸出: Color.RED
print(Color(2)) # 輸出: Color.GREEN
print(Color.RED.name) # 輸出: RED
print(Color.RED.value) # 輸出: 1
# 比較枚舉值
print(Color.RED == Color.GREEN) # 輸出: False
# 迭代枚舉值
for color in Color:
print(color)
# 轉換枚舉值為字串
print(str(Color.BLUE)) # 輸出: 'Color.BLUE'
```