Question

我正在尝试在python2.7中创建一个enum类。我的代码如下：

from enum import Enum

class Alarms(Enum):
    MOTION = "Motion", 0, False
    SOUND = "Sound", 1, False
    FIRE = "Fire", 2, False


    def __new__(cls, *args, **kwds):
        obj = object.__new__(cls)
        obj.value_ = args[0]
        return obj

    def __init__(self, name, modbusAddress, isActive):
        self.name = name
        self.modbusAddress = modbusAddress
        self.isActive = isActive

这是我收到的错误消息：

  File "/usr/lib/python2.7/dist-packages/enum/__init__.py", line 232, in __new__
    enum_member._value_ = member_type(*args)
TypeError: Error when calling the metaclass bases
    object() takes no parameters

Answer 1

尝试以下代码段

from enum import Enum

class Alarms(Enum):
    MOTION = ("Motion", 0, False)
    SOUND = ("Sound", 1, False)
    FIRE = ("Fire", 2, False)

    def __new__(cls, *args, **kwds):
        obj = object.__new__(cls)
        obj.value_ = args[0]
        return obj

    def __init__(self, name, modbusAddress, isActive):
        self._name = name
        self._modbusAddress = modbusAddress
        self._isActive = isActive

Answer 2

您的__new__中有一个错字：

obj.value_ = args[0]

应该是

obj._value_ = args[0]

（请注意下划线）

如果您确实想要value_属性，则需要同时设置两者。

python：object（）没有参数错误

2 个答案: