Change Activity.application_id from `str` to `int`.

discord/activity.py

@@ -28,6 +28,7 @@ import datetime
 
 from .enums import ActivityType, try_enum
 from .colour import Colour
+from .utils import _get_as_snowflake
 
 __all__ = ['Activity', 'Streaming', 'Game', 'Spotify']
 
@@ -93,7 +94,7 @@ class Activity(_ActivityTag):
 
     Attributes
     ------------
-    application_id: :class:`str`
+    application_id: :class:`int`
         The application ID of the game.
     name: :class:`str`
         The name of the activity.
@@ -138,7 +139,7 @@ class Activity(_ActivityTag):
         self.timestamps = kwargs.pop('timestamps', {})
         self.assets = kwargs.pop('assets', {})
         self.party = kwargs.pop('party', {})
-        self.application_id = kwargs.pop('application_id', None)
+        self.application_id = _get_as_snowflake(kwargs, 'application_id')
         self.name = kwargs.pop('name', None)
         self.url = kwargs.pop('url', None)
         self.flags = kwargs.pop('flags', 0)