class wrapper (decorator)

def some_class_decorator(class_: object):
    class ClassWrapper(class_):
        new_attr = 'foo'

        def __init__(self):
            super().__init__()
            self.another_new_attr = 'bar'
    return ClassWrapper


@some_class_decorator
class CustomType:
    some_attr = 1

    def __init__(self):
        self.another_attr = 2


if __name__ == '__main__':
    some_var = CustomType()
    print(some_var.some_attr, some_var.another_attr,
          some_var.new_attr, some_var.another_new_attr, sep='\n')