update the format

polls/models.py

@@ -17,6 +17,7 @@ class Question(models.Model):
         now = timezone.now()
         return now - datetime.timedelta(days=1) <= self.pub_date <= now
 
+
 class Choice(models.Model):
     question = models.ForeignKey(Question, on_delete=models.CASCADE)
     choice_text = models.CharField(max_length=200)