diff --git a/aiogram/bot/api.py b/aiogram/bot/api.py
index 1d0c4f7b..cb258cdf 100644
--- a/aiogram/bot/api.py
+++ b/aiogram/bot/api.py
@@ -80,7 +80,7 @@ def check_result(method_name: str, content_type: str, status_code: int, body: st
         exceptions.NotFound.detect(description)
     elif status_code == HTTPStatus.CONFLICT:
         exceptions.ConflictError.detect(description)
-    elif status_code in [HTTPStatus.UNAUTHORIZED, HTTPStatus.FORBIDDEN]:
+    elif status_code in (HTTPStatus.UNAUTHORIZED, HTTPStatus.FORBIDDEN):
         exceptions.Unauthorized.detect(description)
     elif status_code == HTTPStatus.REQUEST_ENTITY_TOO_LARGE:
         raise exceptions.NetworkError('File too large for uploading. '
diff --git a/aiogram/bot/bot.py b/aiogram/bot/bot.py
index f427fa8c..c5678a37 100644
--- a/aiogram/bot/bot.py
+++ b/aiogram/bot/bot.py
@@ -1135,10 +1135,10 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         permissions = prepare_arg(permissions)
         payload = generate_payload(**locals())
 
-        for permission in ['can_send_messages',
+        for permission in ('can_send_messages',
                            'can_send_media_messages',
                            'can_send_other_messages',
-                           'can_add_web_page_previews']:
+                           'can_add_web_page_previews'):
             if permission in payload:
                 warnings.warn(f"The method `restrict_chat_member` now takes the new user permissions "
                               f"in a single argument of the type ChatPermissions instead of "
diff --git a/aiogram/types/chat_member.py b/aiogram/types/chat_member.py
index 347b2750..274c8a26 100644
--- a/aiogram/types/chat_member.py
+++ b/aiogram/types/chat_member.py
@@ -34,6 +34,9 @@ class ChatMember(base.TelegramObject):
     can_send_other_messages: base.Boolean = fields.Field()
     can_add_web_page_previews: base.Boolean = fields.Field()
 
+    def is_chat_creator(self) -> bool:
+        return ChatMemberStatus.is_chat_creator(self.status)
+
     def is_chat_admin(self) -> bool:
         return ChatMemberStatus.is_chat_admin(self.status)
 
@@ -57,10 +60,14 @@ class ChatMemberStatus(helper.Helper):
     LEFT = helper.Item()  # left
     KICKED = helper.Item()  # kicked
 
+    @classmethod
+    def is_chat_creator(cls, role: str) -> bool:
+        return role == cls.CREATOR
+
     @classmethod
     def is_chat_admin(cls, role: str) -> bool:
-        return role in [cls.ADMINISTRATOR, cls.CREATOR]
+        return role in (cls.ADMINISTRATOR, cls.CREATOR)
 
     @classmethod
     def is_chat_member(cls, role: str) -> bool:
-        return role in [cls.MEMBER, cls.ADMINISTRATOR, cls.CREATOR, cls.RESTRICTED]
+        return role in (cls.MEMBER, cls.ADMINISTRATOR, cls.CREATOR, cls.RESTRICTED)
diff --git a/aiogram/types/input_media.py b/aiogram/types/input_media.py
index 9a77658f..25422df1 100644
--- a/aiogram/types/input_media.py
+++ b/aiogram/types/input_media.py
@@ -239,7 +239,7 @@ class MediaGroup(base.TelegramObject):
         elif not isinstance(media, InputMedia):
             raise TypeError(f"Media must be an instance of InputMedia or dict, not {type(media).__name__}")
 
-        elif media.type in ['document', 'audio', 'animation']:
+        elif media.type in ('document', 'audio', 'animation'):
             raise ValueError(f"This type of media is not supported by media groups!")
 
         self.media.append(media)