from django.core.paginator import Page, Paginator

class ValidAdjacentNumsPage(Page):

    def next_page_number(self):

        if not self.has_next():

            return None

        return super().next_page_number()

    def previous_page_number(self):

        if not self.has_previous():

            return None

        return super().previous_page_number()

class ValidAdjacentNumsPaginator(Paginator):

    def _get_page(self, *args, **kwargs):

        return ValidAdjacentNumsPage(*args, **kwargs)