from abc import ABCMeta, abstractmethod
 
class DynamicAbstractMeta(ABCMeta):
    def __new__(cls, name, bases, namespace):
        if cls not in map(type, bases):
            item_attributes = ["person", "animal"]
            for attribute in item_attributes:
                namespace[attribute] = abstractmethod(lambda x, a=attribute: None)
        return super().__new__(cls, name, bases, namespace)
 
class A(metaclass=DynamicAbstractMeta):
    pass
 
class Item(A):
    def person(self):
        print("person")
 
    def animal(self):
        print("animal")
 
item_instance = Item()
item_instance.person()
item_instance.animal()

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