Format the list of updated properties into a nicer sentence

posttext.py

@@ -0,0 +1,11 @@
+from collections.abc import Sequence
+
+
+def list_to_sentence(list: Sequence[str]) -> str:
+    match len(list):
+        case 0:
+            return str()
+        case 1:
+            return list[0]
+        case _:
+            return " and ".join((", ".join(list[0:-1]), list[-1]))

scl.py

@@ -17,6 +17,7 @@ from sqlalchemy.exc import NoResultFound
 from sqlalchemy.orm import DeclarativeBase, Mapped, Session, mapped_column
 
 from geospatial import DBGeometry, convert_outage_geometry
+from posttext import list_to_sentence
 
 REQUESTS_HEADERS = {"User-Agent": "seattlecitylight-mastodon-bot"}
 POST_DATETIME_FORMAT = "%b %e %l:%M %p"
@@ -433,11 +434,10 @@ with Session(engine) as session:
                         ),
                     )
                 else:
-                    # TODO: this currently just smashes all of the properties together with commas, it'd be nice to make it actually format it like a sentence
                     updated_entries.insert(
                         0,
                         "The {} of this outage have been updated.\n".format(
-                            ", ".join(updated_properties)
+                            list_to_sentence(updated_properties)
                         ),
                     )
                 if max_event_class["is_postable"] and existing_record.initial_post_id: