Add annotations for __str__ methods

Author: dmoisset

polls/models.py

@@ -5,7 +5,7 @@ class Question(models.Model):
     question_text = models.CharField(max_length=200)
     pub_date = models.DateTimeField('date published')
 
-    def __str__(self):
+    def __str__(self) -> str:
         return self.question_text
 
 
@@ -14,6 +14,6 @@ class Choice(models.Model):
     choice_text = models.CharField(max_length=200)
     votes = models.IntegerField(default=0)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return self.question_text