general: migrate modules to use 3.9 features

my/vk/favorites.py

@@ -1,20 +1,21 @@
 # todo: uses my private export script?, timezone
+from __future__ import annotations
+
+import json
+from collections.abc import Iterable, Iterator
 from dataclasses import dataclass
 from datetime import datetime, timezone
-import json
-from typing import Iterator, Iterable, Optional
-
-from my.core import Json, datetime_aware, stat, Stats
-from my.core.error import Res
 
 from my.config import vk as config  # type: ignore[attr-defined]
+from my.core import Json, Stats, datetime_aware, stat
+from my.core.error import Res
 
 
 @dataclass
 class Favorite:
     dt: datetime_aware
     title: str
-    url: Optional[str]
+    url: str | None
     text: str
 
 

my/vk/vk_messages_backup.py

@@ -2,18 +2,16 @@
 VK data (exported by [[https://github.com/Totktonada/vk_messages_backup][Totktonada/vk_messages_backup]])
 '''
 # note: could reuse the original repo, but little point I guess since VK closed their API
+import json
+from collections.abc import Iterator
 from dataclasses import dataclass
 from datetime import datetime
-import json
-from typing import Dict, Iterator
 
 import pytz
 
-from my.core import stat, Stats, Json, Res, datetime_aware, get_files
-from my.core.common import unique_everseen
-
 from my.config import vk_messages_backup as config
-
+from my.core import Json, Res, Stats, datetime_aware, get_files, stat
+from my.core.common import unique_everseen
 
 # I think vk_messages_backup used this tz?
 # not sure if vk actually used to return this tz in api?
@@ -45,7 +43,7 @@ class Message:
     body: str
 
 
-Users = Dict[Uid, User]
+Users = dict[Uid, User]
 
 
 def users() -> Users: