flake8-classmethod-staticmethod

flake8 plugin that checks rules regarding the staticmethod and classmethod decorators.

Options

The plugin offers one flag, --select_csm1, accepting a list of error codes (see below) to be enabled. By default, the enabled errors are CSM101 and CSM131.

Error Codes

CSM100

@staticmethod should not be used.

CSM101

A method marked as @staticmethod should not reference the class it is defined in. Use @classmethod otherwise.

Bad

class MyClass:
    @staticmethod
    def my_name():
        return MyClass.__name__

Good

class MyClass:
    @classmethod
    def my_name(cls):
        return cls.__name__

CSM102

Do not inherit and override a method marked as @staticmethod.

Bad

class MyClass:
    @staticmethod
    def my_name():
        return "MyClass"

class MyChild:
    @staticmethod
    def my_name():
        return "MyChild"

Good

class MyClass:
    @classmethod
    def my_name(cls):
        return cls.__name__

CSM130

@classmethod should not be used.

CSM131

A method marked as @classmethod should access the parameter cls. Use @staticmethod otherwise. A special case that is exempt is a method that has a call to super().

Bad

class MyClass:
    @classmethod
    def my_name(cls):
        return "MyClass"

Good

class MyClass:
    @staticmethod
    def my_name():
        return "MyClass"

CSM132

A method marked as @classmethod should not reference the class it is defined in. Use the cls parameter.

class MyClass:
    @classmethod
    def my_name(cls):
        return MyClass.__name__

Good

class MyClass:
    @classmethod
    def my_name(cls):
        return cls.__name__