<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def tag_list(self, other_model=None, queryset=None):
 """ Restituisce un queryset di tag comuni al model corrente e al model o queryset passati come argomento """

        from taggit.models import Tag
        return Tag.objects.filter(id__in=self._taglist(other_model, queryset))