【python入门到精通】python中的枚举类

from enum import Enum
class traffictlight(Enum):     #继承枚举类，枚举成员不可重复
    RED=1       #枚举成员    RED是枚举的名字，1是枚举的值
    YELLOW=2
    GREEN=3
#枚举成员的比较    print(traffictlight.YELLOW.value == 1)   返回True
print(type(traffictlight.YELLOW))
print(traffictlight.YELLOW.name)
print(traffictlight.YELLOW.value)
print(traffictlight(2))            #通过枚举值获取枚举成员
def judge(color):
  if color ==traffictlight.RED or color==traffictlight.YELLOW:   
      print("司机超速")
  else:
    print("正常行驶")
judge(traffictlight.GREEN)
#输出：
<enum'traffictlight'>
YELLOW
2
traffictlightYELLOW
正常行驶