diff --git a/site/ruff/rules/abstract-base-class-without-abstract-method/index.html b/site/ruff/rules/abstract-base-class-without-abstract-method/index.html index 57dea577e..6c9c5c564 100644 --- a/site/ruff/rules/abstract-base-class-without-abstract-method/index.html +++ b/site/ruff/rules/abstract-base-class-without-abstract-method/index.html @@ -820,29 +820,37 @@

abstract-base-class-without-abstract-method (B024)

Derived from the flake8-bugbear linter.

What it does

-

Checks for abstract classes without abstract methods.

+

Checks for abstract classes without abstract methods or abstract class variables. +Annotated but unassigned class variables are regarded as abstract.

Why is this bad?

Abstract base classes are used to define interfaces. If an abstract base -class has no abstract methods, you may have forgotten to add an abstract +class has no abstract methods or abstract class variables, you may have forgotten +to add an abstract method to the class or omitted an @abstractmethod decorator.

If the class is not meant to be used as an interface, consider removing the ABC base class from the class definition.

Example

from abc import ABC
-
+from typing import ClassVar
 
-class Foo(ABC):
-    def method(self):
-        bar()
+
+class Foo(ABC):
+    class_var: ClassVar[str] = "assigned"
+
+    def method(self):
+        bar()

Use instead:

from abc import ABC, abstractmethod
-
+from typing import ClassVar
 
-class Foo(ABC):
-    @abstractmethod
-    def method(self):
-        bar()
+
+class Foo(ABC):
+    class_var: ClassVar[str]
+
+    @abstractmethod
+    def method(self):
+        bar()

References