Исправить ошибку в примере на джангобук ру

body { background: white url ("images / fon.gif") no-repeat middle center; }

@python_2_unicode_compatible
class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)
    def __str__(self): return self.choice_text #1 вариант
 
    def was_published_recently(self): #2 вариант
        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
 
    def was_published_recently(self): #3 вариант
        now = timezone.now()
            return now - datetime.timedelta(days=1) <= self.pub_date <= now

@python_2_unicode_compatible
class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    #def __str__(self): return self.question_text
    def was_published_recently(self):
        now = timezone.now()
            return now - datetime.timedelta(days=1) <= self.pub_date <= now

@python_2_unicode_compatible
class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    def __str__(self): return self.question_text
 
def was_published_recently(self):
    now = timezone.now()
        return now - datetime.timedelta(days=1) <= self.pub_date <= now

@python_2_unicode_compatible
class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    
    def __str__(self): 
        return self.question_text
 
    def was_published_recently(self):
        now = timezone.now()
        return now - datetime.timedelta(days=1) <= self.pub_date <= now