old_contents: import datetime
  
  from django.db import models
  from django.utils import timezone
  
  class Question(models.Model):
      question_text = models.CharField(max_length=200)
      pub_date = models.DateTimeField('date published')
      def __unicode__(self):              # __unicode__ on Python 2 ; __str__ on Python 3
          return self.question_text
  
  
  class Choice(models.Model):
      question = models.ForeignKey(Question)
      choice_text = models.CharField(max_length=200)
      votes = models.IntegerField(default=0)
      def __unicode__(self):              # __unicode__ on Python 2 ; __str__ on Python 3
          return self.choice_text
      def was_published_recently(self):
          return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
      was_published_recently.admin_order_field = 'pub_date'
      was_published_recently.boolean = True
      was_published_recently.short_description = 'Published recently?'
new_contents: import datetime
  
  from django.db import models
  from django.utils import timezone
  
  class Question(models.Model):
      question_text = models.CharField(max_length=200)
      pub_date = models.DateTimeField('date published')
      def __unicode__(self):              # __unicode__ on Python 2 ; __str__ on Python 3
          return self.question_text
      def was_published_recently(self):
          return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
      was_published_recently.admin_order_field = 'pub_date'
      was_published_recently.boolean = True
      was_published_recently.short_description = 'Published recently?'
  
  
  class Choice(models.Model):
      question = models.ForeignKey(Question)
      choice_text = models.CharField(max_length=200)
      votes = models.IntegerField(default=0)
      def __unicode__(self):              # __unicode__ on Python 2 ; __str__ on Python 3
          return self.choice_text
subject: edit admin.py