add time limit to exams

anatomy/models.py

@@ -181,7 +181,9 @@ class AnatomyQuestion(models.Model):
                 if i.status != i.MarkOptions.UNMARKED
             ]
         )
-        correct_answers = set([i.answer.get_compare_string() for i in self.answers.all()])
+        correct_answers = set(
+            [i.answer.get_compare_string() for i in self.answers.all()]
+        )
         half_mark_answers = set(
             [i.answer.get_compare_string() for i in self.half_mark_answers.all()]
         )
@@ -266,6 +268,10 @@ class Exam(models.Model):
         help_text="If the json cache needs updating", default=False
     )
 
+    time_limit = models.IntegerField(
+        help_text="Exam time limit (in seconds)", default=False
+    )
+
     def __str__(self):
         return self.name
 
@@ -366,11 +372,9 @@ class CidUserAnswer(models.Model):
             is not None
         ):
             mark = 1
-        elif (            
-            q.answers.filter(
-                answer__iexact=ans, status=Answer.MarkOptions.INCORRECT
-            ).first()
-        ):
+        elif q.answers.filter(
+            answer__iexact=ans, status=Answer.MarkOptions.INCORRECT
+        ).first():
             mark = 0
         else:
             mark = "unmarked"