英文:
How to initialize named tuple in python enum
问题
以下是您提供的代码部分的翻译：
我有一个Enum，它被用作SqlALchemy中的列数据类型。但我需要更多的Enum属性，以使它能够在代码的其他功能中访问。这是我目前创建的内容：class ServerHealth(Enum):"""服务器健康状态。"""HealthStatus = namedtuple("HealthStatus", ["name", "low_bound", "high_bound"])High = HealthStatus(name="High", low_bound=5, high_bound=24)Fair = HealthStatus(name="Fair", low_bound=3, high_bound=5)Low = HealthStatus(name="Low", low_bound=0, high_bound=3)@DynamicClassAttributedef value(self):return self.name这也在SqlAlchemy模型的某处使用，所以我需要保持它不会破坏-class Server(Base):server_health = Column(ENUM(ServerHealth), nullable=True)我需要将namedtuple的"name"作为数据库中的列值。据我理解，value属性由SqlAlchemy使用，所以我已经重写了它们，value按预期工作，即。>>>ServerHealth.High.value"High"但当我尝试访问low_bound和high_bound时，它会出错>>>ServerHealth.High.low_boundAttributeError Traceback (most recent call last)Input In [77], in <cell line: 1>()----> 1 ServerHealth.High.low_boundAttributeError: 'ServerHealth'对象没有属性'low_bound'现在，我应该重写哪个函数以使其正常工作而不破坏数据库初始化？
英文:
I have a Enum which is used as a column datatype in SqlALchemy. But I need more properties of the Enum to make it accessible for the code's other functionality.
This is what I have created till now:
class ServerHealth(Enum):"""Status of Server health."""HealthStatus = namedtuple("HealthStatus", ["name", "low_bound", "high_bound"])High = HealthStatus(name="High", low_bound=5, high_bound=24)Fair = HealthStatus(name="Fair", low_bound=3, high_bound=5)Low = HealthStatus(name="Low", low_bound=0, high_bound=3)@DynamicClassAttributedef value(self):return self.name
This is used somewhere in sqlalchemy model as well, so I need to keep it the way it doesn't break-
class Server(Base):server_health = Column(ENUM(ServerHealth), nullable=True)
I need the "name" of namedtuple as the columns value in DB. As per my understanding the value attribute is used by sqlalchemy, so I have overwritten them and the value works as expected i.e.
>>>ServerHealth.High.value"High"
but when I try to access low_bound and high_bound it breaks
>>>ServerHealth.High.low_boundAttributeError Traceback (most recent call last)Input In [77], in <cell line: 1>()----> 1 ServerHealth.High.low_boundAttributeError: 'ServerHealth' object has no attribute 'low_bound'
Now what function should I overwrite in order to get that working without breaking db initialization.
答案1
得分: 1
这是我会这样做的：
class ServerHealth(Enum):"""服务器健康状态。"""def __new__(cls, name, low_bound, high_bound):member = object.__new__(cls)member._value_ = namemember.low_bound = low_boundmember.high_bound = high_boundreturn memberHIGH = "High", 5, 24FAIR = "Fair", 3, 5LOW = "Low", 0, 3
在使用中：
>>> ServerHealth.High.low_bound5
披露：我是Python标准库Enum、enum34后端和高级枚举(aenum)库的作者。
英文:
This is how I would do it:
class ServerHealth(Enum):"""Status of Server health."""def __new__(cls, name, low_bound, high_bound):member = object.__new__(cls)member._value_ = namemember.low_bound = low_boundmember.high_bound = high_boundreturn member#HIGH = "High", 5, 24FAIR = "Fair", 3, 5LOW = "Low", 0, 3
and in use:
>>> ServerHealth.High.low_bound5
Disclosure: I am the author of the Python stdlib Enum, the enum34 backport, and the Advanced Enumeration (aenum) library.
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