diff --git a/aleksis/apps/alsijil/models.py b/aleksis/apps/alsijil/models.py
index dfae4a37271b81a2804597c30524a29efcbcb91b..0a914175615677d0371a2c90311485dd928d9b28 100644
--- a/aleksis/apps/alsijil/models.py
+++ b/aleksis/apps/alsijil/models.py
@@ -600,7 +600,7 @@ class Documentation(CalendarEvent):
     @classmethod
     def parse_dummy(
             cls,
-            id: string,
+            _id: str,
     ) -> tuple:
         """Parse dummy id string into lesson_event, datetime_start, datetime_end.
         """
@@ -622,7 +622,7 @@ class Documentation(CalendarEvent):
             lesson_event: LessonEvent,
             datetime_start: datetime,
             datetime_end: datetime,
-    ) -> Documentation:
+    ) -> "Documentation":
         """ Create a documentation from a lesson_event with start and end datetime.
         User is needed for permission checking.
         """
diff --git a/aleksis/apps/alsijil/schema/__init__.py b/aleksis/apps/alsijil/schema/__init__.py
index 99ace0ccf8d1a3a9c6ccac9fa2a50712af55cc0b..46174ddb72be862898d316c6e08078baf25496ca 100644
--- a/aleksis/apps/alsijil/schema/__init__.py
+++ b/aleksis/apps/alsijil/schema/__init__.py
@@ -158,7 +158,7 @@ class Query(graphene.ObjectType):
         lessons_for_person = []
         for person in persons:
             docs, dummies = Documentation.get_documentations_for_person(
-                person
+                person,
                 datetime.combine(start, datetime.min.time()),
                 datetime.combine(end, datetime.max.time()),
             )
diff --git a/aleksis/apps/alsijil/schema/absences.py b/aleksis/apps/alsijil/schema/absences.py
index 3958a1eae168d32fee0a59d6119424e66bfc19d2..663455671de7b8f2c420bb4ab8d332ffda3c61d2 100644
--- a/aleksis/apps/alsijil/schema/absences.py
+++ b/aleksis/apps/alsijil/schema/absences.py
@@ -13,9 +13,9 @@ class LessonsForPersonType(graphene.ObjectType):
 class AbsencesBatchCreateMutation(graphene.Mutation):
     class Arguments:
         persons = graphene.List(graphene.ID)
-        start = graphene.Date(),
-        end = graphene.Date(),
-        comment  = graphene.String(),
+        start = graphene.Date()
+        end = graphene.Date()
+        comment = graphene.String()
         reason = graphene.ID()
 
     ok = graphene.Boolean()
@@ -37,7 +37,7 @@ class AbsencesBatchCreateMutation(graphene.Mutation):
             )
 
             # Create doc for dummies that are already in the past
-            future = false
+            future = False
             for dummy in dummies:
                 lesson_event, dummy_start, dummy_end = Documentation.parse_dummy(dummy.id)
 
@@ -52,7 +52,7 @@ class AbsencesBatchCreateMutation(graphene.Mutation):
                         )
                     )
                 else:
-                    future = true
+                    future = True
 
             # Create a ParticipationStatus for each documentation
             for doc in docs: