问题
Follow up question to this one:
Django merge 2 querysets in staggered/alternating fashion?
I'm wondering is there an efficient way to avoid duplicates in the result? i.e. the generators will only return items we have not seen before.
来源：https://stackoverflow.com/questions/45834009/django-merge-2-querysets-in-staggered-alternating-fashion-without-duplicates