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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_ancestors_path(self, model, levels=None):
 """ Serves as an opposite to _get_subclasses_recurse, instead walking from the Model class up the Model's ancestry and constructing the desired select_related string backwards. """

        if not issubclass(model, self.model):
            raise ValueError(
                "%r is not a subclass of %r" % (model, self.model))

        ancestry = []
        # should be a OneToOneField or None
        parent_link = model._meta.get_ancestor_link(self.model)
        if levels:
            levels -= 1
        while parent_link is not None:
            related = parent_link.remote_field
            ancestry.insert(0, related.get_accessor_name())
            if levels or levels is None:
                parent_model = related.model
                parent_link = parent_model._meta.get_ancestor_link(
                    self.model)
            else:
                parent_link = None
        return LOOKUP_SEP.join(ancestry)