In order to override a class method, the overriding method should also be decorated as a class method and take a required parameter cls, from which you can get class attributes. This is important to keep in mind when overriding things like PynamoDB models.

Example# 

class OverridingClass(Model):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    @classmethod
    def classmethod(cls, *args, **kwargs):
        class_attribute_example = cls.class_attribute
        return super().classmethod(*args, **kwargs)