Add docstrings

aleksis/apps/chronos/util/chronos_helpers.py

@@ -47,6 +47,7 @@ def get_substitution_by_id(request: HttpRequest, id_: int, week: int):
 
 
 def get_teachers(user: User):
+    """Get the teachers whose timetables are allowed to be seen by current user."""
     checker = ObjectPermissionChecker(user)
 
     teachers = (
@@ -70,6 +71,7 @@ def get_teachers(user: User):
 
 
 def get_classes(user: User):
+    """Get the classes whose timetables are allowed to be seen by current user."""
     checker = ObjectPermissionChecker(user)
 
     classes = (
@@ -103,6 +105,7 @@ def get_classes(user: User):
 
 
 def get_rooms(user: User):
+    """Get the rooms whose timetables are allowed to be seen by current user."""
     checker = ObjectPermissionChecker(user)
 
     rooms = (