关于python：我如何比较timezone.now和item.deadline

how can i compare timezone.now and item.deadline

嗨，我要服务old book sale service for university student

我创建了itempost模型，当用户发布他们的书籍时，itempost的截止日期保存在deadline中。

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from django.db import models
from django.conf import settings
from django.utils import timezone

def localtime():
return timezone.localtime(timezone.now())

class ItemPost(models.Model):

title = models.TextField(
)

created_at = models.DateTimeField(
default=localtime
)

is_deleted = models.BooleanField(
default=False,
verbose_name="??? ???",
)

# ????? ??? ??
def deadline_def(self):
year_of_item_created = self.created_at.year

if self.created_at.month <= 6:
return timezone.datetime(year_of_item_created, 6, 30)
else:
return timezone.datetime(year_of_item_created, 12, 31)

deadline = property(deadline_def)

# ??? ??? ?? ????? ??
def is_ended_semester_def(self):
now = timezone.now()
if now > self.deadline:
return True
return False

is_ended_semester = property(is_ended_semester_def)

def __str__(self):
return self.title

我要比较项目的截止日期、时区。现在())

并返回真或假

但如果我命令item.is_ended_semester我就不能

埃多克斯1〔3〕

我怎么解决这个问题？

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item.deadline
> datetime.datetime(2017, 6, 30, 0, 0)

timezone.now()
> datetime.datetime(2017, 7, 14, 8, 50, 57, 91304, tzinfo=<UTC>)

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