#33415: @classproperty breakes @abc.abstractmethod
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Reporter: Behoston | Owner: nobody
Type: Bug | Status: new
Component: Utilities | Version: 4.0
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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I'm trying to do something weird, but I found an interesting bug:
{{{
#!div style="font-size: 100%"
Example:
{{{#!python
import abc
import inspect
from django.utils.functional import classproperty
class A(metaclass=abc.ABCMeta):
@classproperty
@abc.abstractmethod
def x(self):
pass
print(inspect.isabstract(A)) # False
}}}
}}}
This prints False. It should print True, due to method x is not
implemented.
It works a little bit better when @abc.abstractmethod is first
decorator. Then class is recoginsed as abstract. However, subclass of this
class is always not-abstract.
{{{
#!div style="font-size: 100%"
Example:
{{{#!python
import abc
import inspect
from django.utils.functional import classproperty
class A(metaclass=abc.ABCMeta):
@abc.abstractmethod
@classproperty
def x(self):
pass
class B(A, metaclass=abc.ABCMeta):
pass
print(inspect.isabstract(A)) # True
print(inspect.isabstract(B)) # False
}}}
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/33415>
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