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Avoiding ORM Traps and the N+1 Problem in Python
一文讲透Python ORM中的N+1陷阱，用代码实例教你用select_related/prefetch_related告别性能灾难。
Introduction Python's ORMs — SQLAlchemy and the Django ORM — are a joy to write and dangerously easy to make slow. A loop over a queryset that reads o…