CODEWITHSUNDEEP
pythonpython-3.xenums
jett chen
jett chen

Reputation: 1173

Why property is same while inherit abc.ABC class?

I am use python3.8 and I create two services(ForwarderService, LogService) ,But it confused me why the two service type is the same and how solve it?

The Code

from enum import Enum, auto
import abc

class ServiceType(Enum):
    Forwarder = auto
    Log = auto

class Service(metaclass=abc.ABCMeta):
    @property
    @abc.abstractmethod
    def type(self) -> ServiceType:pass


class ForwarderService(Service):
    @property
    def type(self) -> ServiceType:
        return ServiceType.Forwarder

class LogService(Service):
    @property
    def type(self) -> ServiceType:
        return ServiceType.Log


s1 = ForwarderService()
s2 = LogService()

print(s1.type, s2.type)

The Result

ServiceType.Forwarder ServiceType.Forwarder

I want s1.type is ServiceType.Forwarder and s2.type is ServiceType.Log ?

Upvotes: 1

Views: 35

Answers (1)

juanpa.arrivillaga
juanpa.arrivillaga

Reputation: 96172

You have a typo:

class ServiceType(Enum):
    Forwarder = auto
    Log = auto

Should be:

class ServiceType(Enum):
    Forwarder = auto()
    Log = auto()

Otherwise, it interprets it as the same value, in which case, you end up with only one enum object for the enum type, with Log acting as an alias.

So, consider:

>>> from enum import Enum
>>> class Foo(Enum):
...     bar = 0
...     baz = 0
...
>>> list(Foo)
[<Foo.bar: 0>]
>>> Foo.baz
<Foo.bar: 0>

Upvotes: 3

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