python: Rewrite list() as [].

Suggested by the flake8-comprehensions plugin.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/lib/import_realm.py

@@ -1139,7 +1139,7 @@ def get_incoming_message_ids(import_dir: Path,
     '''
 
     if sort_by_date:
-        tups: List[Tuple[int, int]] = list()
+        tups: List[Tuple[int, int]] = []
     else:
         message_ids: List[int] = []
 

zerver/lib/markdown/__init__.py

@@ -2124,7 +2124,7 @@ def privacy_clean_markdown(content: str) -> str:
 
 def get_possible_mentions_info(realm_id: int, mention_texts: Set[str]) -> List[FullNameInfo]:
     if not mention_texts:
-        return list()
+        return []
 
     # Remove the trailing part of the `name|id` mention syntax,
     # thus storing only full names in full_names.

zerver/lib/message.py

@@ -1179,7 +1179,7 @@ def get_recent_private_conversations(user_profile: UserProfile) -> Dict[int, Dic
     for recipient_id, max_message_id in rows:
         recipient_map[recipient_id] = dict(
             max_message_id=max_message_id,
-            user_ids=list(),
+            user_ids=[],
         )
 
     # Now we need to map all the recipient_id objects to lists of user IDs