Improve typing annotations

ahtcg_bot.py

@@ -15,7 +15,7 @@ class ArkhamDBUpdater(commands.Bot):
     channel_list: set[int]
     arkhamdb_client: ArkhamDBClient
 
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
         # TODO: should really be a database
@@ -29,9 +29,9 @@ class ArkhamDBUpdater(commands.Bot):
         await self.arkhamdb_client.close()
         await super().close()
 
-    def setup_commands(self):
+    def setup_commands(self) -> None:
         @self.command(name='monitor')
-        async def monitor(ctx: commands.Context):
+        async def monitor(ctx: commands.Context) -> None:
             """Watch this channel for deck links and link to latest versions."""
             await ctx.message.reply('Now monitoring this channel for deck IDs', mention_author=True)
             self.channel_list.add(ctx.message.channel.id)
@@ -39,14 +39,14 @@ class ArkhamDBUpdater(commands.Bot):
                 json.dump(list(self.channel_list), f)
 
         @self.command(name='forget')
-        async def forget(ctx: commands.Context):
+        async def forget(ctx: commands.Context) -> None:
             """Remove this channel from the monitor list"""
             await ctx.message.reply('No longer monitoring this channel for deck IDs', mention_author=True)
             self.channel_list.discard(ctx.message.channel.id)
             with open('channel_list.json', 'w') as f:
                 json.dump(list(self.channel_list), f)
 
-    async def on_ready(self):
+    async def on_ready(self) -> None:
         print(f'Logged in as {self.user} (ID: {self.user.id})')
         print('Enabled on servers:')
         async for guild in self.fetch_guilds(limit=150):
@@ -118,14 +118,14 @@ class ArkhamDBUpdater(commands.Bot):
            message.channel.id in self.channel_list:
             await self.update_channel_latest_decks(message.channel)
 
-    async def on_message(self, message: discord.Message):
+    async def on_message(self, message: discord.Message) -> None:
         await self.process_commands(message)
         await self.maybe_update_channel_for_message(message)
 
-    async def on_message_edit(self, before: discord.Message, after: discord.Message):
+    async def on_message_edit(self, before: discord.Message, after: discord.Message) -> None:
         await self.maybe_update_channel_for_message(after)
 
-    async def on_message_delete(self, message: discord.Message):
+    async def on_message_delete(self, message: discord.Message) -> None:
         await self.maybe_update_channel_for_message(message)
 
     @tasks.loop(hours=1)

arkhamdb.py

@@ -34,11 +34,11 @@ class ArkhamDBClient:
 
     origin: str
 
-    def __init__(self, arkhamdb_origin: str = ARKHAMDB_ORIGIN):
+    def __init__(self, arkhamdb_origin: str = ARKHAMDB_ORIGIN) -> None:
         self._session = aiohttp.ClientSession()
         self.origin = arkhamdb_origin
 
-    async def close(self):
+    async def close(self) -> None:
         await self._session.close()
 
     async def get_latest_deck(self, deck_id: int) -> ArkhamDBDeck: