1，根据排序结果删除部分
not_delete_list= M_log.objects.filter(user='xxx').order_by('-id')[:4].values_list("id",flat=True)
M_log.objects.exclude(pk__in=list(not_delete_list) ).delete()
1，根据排序结果删除部分
not_delete_list= M_log.objects.filter(user='xxx').order_by('-id')[:4].values_list("id",flat=True)
M_log.objects.exclude(pk__in=list(not_delete_list) ).delete()
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