Python 类型错误：不支持的操作数类型 -：'datetime.time' 和 'datetime.time'
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TypeError: unsupported operand type(s) for -: 'datetime.time' and 'datetime.time'
提问by Gaurav Tomer
my models.py:
我的模型.py：
class Attendancename(models.Model):
teacher_name = models.ForeignKey(Teachername, default='Ram')
date = models.DateField('Date', default=datetime.datetime.today)
intime = models.TimeField('IN-TIME', auto_now=True)
outtime = models.TimeField('OUT-TIME', auto_now=True)
def hours_conversion(self):
startdelta = datetime.timedelta(hours=self.intime.hours, minutes=self.intime.minutes, seconds=self.intime.seconds)
enddelta = datetime.timedelta(hours=self.outtime.hours, minutes=self.outtime.minutes, seconds=self.outtime.seconds)
return (enddelta-startdelta).seconds/3600
def __str__(self):
return "%s" %self.teacher_name
my views.py:
我的意见.py：
def add_atten(request):
if request.method == 'POST':
form = AttendancenameForm(request.POST)
if form.is_valid():
form.save()
return HttpResponseRedirect(reverse('student:listatten'))
else:
print(form.errors)
else:
form = AttendancenameForm()
return render(request, 'add_atten.html', {'form': form},)
my forms.py:
我的forms.py：
class AttendancenameForm(ModelForm):
intime = forms.TimeField(input_formats=('%H:%M',))
outtime = forms.TimeField(input_formats=('%H:%M',))
teacher_name = forms.ModelChoiceField(queryset=Teachername.objects.all())
class Meta:
model = Attendancename
fields = ('teacher_name', 'date', 'intime', 'outtime',)
Actually I'm trying to calculate total number of hours based on difference of 'intime'and 'outtime'in my models.py file but it raises above erroe. I think I'm doing syntax error. Can anybody Please tell me what is the correct syntax or method to do so?
Any body please suggest me what to do to fix it?
实际上，我正在尝试根据我的 models.py 文件中的'intime'和 的差异来计算总小时数，'outtime'但它提高了错误率。我想我在做语法错误。任何人都可以请告诉我这样做的正确语法或方法是什么？任何机构请建议我如何解决它？
回答by OldTinfoil
It's because you cannot subtract a datetime.timefrom a datetime.time. Convert them to datetime.datetimeobjects and it'll return a datetime.timedeltaobject that you could use.
这是因为你不能datetime.time从 a 中减去a datetime.time。将它们转换为datetime.datetime对象，它将返回一个datetime.timedelta您可以使用的对象。
If you're lucky enough to be using Django 1.8, they now have a DurationFieldthat can be used.
如果您有幸使用Django 1.8，他们现在有一个DurationField可以使用的。
Failing that, I would recommend converting the timedeltainto either seconds or a floating point representation so you can actually store it to the database.
如果做不到这一点，我建议将其timedelta转换为秒或浮点表示，以便您可以将其实际存储到数据库中。
EDIT:Pulled up in comments for half arsing an answer.
编辑：在评论中拉起半个回答。
For example - if you want to store the number of (integer) seconds, you can convert from a TimeDeltaby using secs = td // timedelta(seconds=1).
例如 - 如果要存储（整数）秒数，可以TimeDelta使用secs = td // timedelta(seconds=1).
