Move append_if_all to util and add typing/docstring

aleksis/apps/alsijil/util.py

+from typing import List
+
+
+def append_if_all(iterable: List, *args) -> List:
+    """Append args to a list if all args are true-like."""
+    if all(args):
+        for a in args:
+            iterable.append(a)
+    return iterable

aleksis/apps/alsijil/views.py

@@ -13,6 +13,7 @@ from django_tables2 import SingleTableView
 from reversion.views import RevisionMixin
 from rules.contrib.views import PermissionRequiredMixin
 
+from aleksis.apps.alsijil.util import append_if_all
 from aleksis.apps.chronos.managers import TimetableType
 from aleksis.apps.chronos.models import LessonPeriod
 from aleksis.apps.chronos.util.chronos_helpers import get_el_by_pk
@@ -294,11 +295,6 @@ def week_view(
         lesson_periods, key=lambda x: (x.period.weekday, x.period.period)
     )
 
-    def append_if_all(iterable, *args):
-        if all(args):
-            for a in args:
-                iterable.append(a)
-
     context["extra_marks"] = ExtraMark.objects.all()
     context["week"] = wanted_week
     context["weeks"] = get_weeks_for_year(year=wanted_week.year)