Fix.

commands.py

@@ -8,7 +8,7 @@ from ujson import dumps
 from tortoise.exceptions import IntegrityError
 from telethon.utils import get_display_name, get_peer_id
 from aiofiles.os import remove
-from aiofiles.os.path import isfile
+from aiofiles.os import path
 from emoji import is_emoji
 
 from actions import (
@@ -169,7 +169,7 @@ async def make_message_shot(bot, message):
   output_path = make_temporary_filename('png')
   avatar_path = await make_cache_filename(sender_id, 'png')
 
-  if not await isfile(avatar_path):
+  if not await path.isfile(avatar_path):
     await bot.download_profile_photo(sender_id, file=avatar_path)
 
     # TO-DO: make it better.

utils.py

@@ -4,7 +4,7 @@ from datetime import datetime
 from collections import namedtuple
 
 from aiofiles.os import mkdir
-from aiofiles.os.path import isdir
+from aiofiles.os import path
 
 from telethon.utils import get_display_name
 from telethon.tl.types import (
@@ -102,7 +102,7 @@ def make_temporary_filename(ext):
 CACHE_DIR = './cache'
 
 async def make_cache_filename(id, ext):
-  if not await isdir(CACHE_DIR):
+  if not await path.isdir(CACHE_DIR):
     await mkdir(CACHE_DIR)
 
   return f'{CACHE_DIR}/{id}.{ext}'