Django - 无法让时间函数(时区、日期时间)正常工作，获取 ErrorName 消息 : global name not defined

Question

我是 Django 新手，

我正在学习教程，我必须创建两个如下所示的模型:

import datetime
from django.db import models
from django.utils import timezone

class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

    def __unicode__(self):
        return self.question

    def was_published_recently(self):
        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)


class Choice(models.Model):
    poll = models.ForeignKey(Poll)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField()

    def __unicode__(self):
        return self.choice_text

以下代码来自教程。我应该得到True。

# Make sure our custom method worked.
>>> p = Poll.objects.get(pk=1)
>>> p.was_published_recently()
True

但是当我输入(与教程相同的行)时:

>>> p = Poll.objects.get(pk=1)
>>> p.was_published_recently()

我收到以下错误消息:

models.py line 12 in was_published_recently
NameError: global name 'datetime' is not defined..

我进口的 datetime和 timezone ...我不明白为什么会收到该错误消息。

任何帮助将不胜感激! :-)

Answer 1

You need to import Timezone first from Django utils and after that you need to import datetime.

from django.db import models
    from django.utils import timezone
    import datetime