Invalid abstract class definition and usages

Reports invalid definition and usages of abstract classes.

Example:

from abc import abstractmethod, ABC

class Figure(ABC):

    @abstractmethod
    def do_figure(self):
        pass

class Triangle(Figure):  # Not all abstract methods are defined in 'Triangle' class
    def do_triangle(self):
        pass

Triangle()  # Cannot instantiate abstract class 'Triangle'

When the quick-fix is applied, the IDE implements an abstract method for the Triangle class:

from abc import abstractmethod, ABC

class Figure(ABC):

    @abstractmethod
    def do_figure(self):
        pass

class Triangle(Figure):
    def do_figure(self):
        pass

    def do_triangle(self):
        pass

Triangle()

It also warns you if abc.abstractmethod is used in a class whose metaclass is not abc.ABCMeta:

from abc import abstractmethod


class MyClass:
    @abstractmethod  # 'MyClass' is not abstract
    def foo(self):
        ...

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

PyAbstractClass

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Python

Inspection ID: PyAbstractClassInspection

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection PyAbstractClass

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details
By default bundled with:	CLion 2025.2, DataSpell 2025.2, PyCharm 2025.2,
Can be installed with plugin:	Python Community Edition, 252.26661.0

Last modified: 18 September 2025