models.Book.objects.filter(id__gt=2) # 大于
models.Book.objects.filter(id__lt=2) # 小于
models.Book.objects.filter(id__in=[1,2,3]) # =
models.Book.objects.filter(title__contains="python") # 包含
models.Book.objects.filter(title__icontains="python") # 不区分大小写
models.Publisher.objects.filter(book__title="python").values("name")
重要:从Publisher查book,双下划线
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