django 减去日期时间字段

Question

我使用的模型具有名为 start_time 和 finish_time 的字段，两者都是 DateTimeField，我试图通过用 start_time 减去 finish_time 来计算响应时间。在外壳中：>>> obj = Quizgame.objects.get(user=harry)>>> start = obj.start_time>>> end = obj.finish_time>>> result = end - start>>> resultdatetime.timedelta(seconds=31, microseconds=912224)但是在 django Views 中，当我执行此操作时，我会收到错误消息，即 -: 'method' 和 'datetime.datetime' 不受支持的操作数类型views.pydef final_part(request):    obj = Quizgame.objects.get(user=request.user)    start = obj.start_time    end = obj.end_time    result = end - start    return HttpResponse(result)models.pyclass Quizgame(models.Model):    user = models.OneToOneField(User, on_delete=models.CASCADE)    total_score = models.DecimalField("Total score", default=0, decimal_places=2, max_digits=6)    start_time = models.DateTimeField(auto_now_add=True)    finish_time = models.DateTimeField(null=True)我稍后使用 datetime.datetime.now() 设置完成时间

Answer 1

您使用 obj.end_time 而不是 obj.finish_time

def final_part(request):

    obj = Quizgame.objects.get(user=request.user)

    start = obj.start_time

    end = obj.finish_time

    result = end - start

    return HttpResponse(result)