Support python 3.10 union

Author: CodeWithSwastik

discord/app/commands.py

@@ -25,6 +25,7 @@
 from __future__ import annotations
 
 import asyncio
+import types
 from discord.types.channel import TextChannel, VoiceChannel
 import functools
 import inspect
@@ -336,7 +337,6 @@ def __init__(self, func: Callable, *args, **kwargs) -> None:
     def parse_options(self, params) -> List[Option]:
         final_options = []
 
-        params = self._get_signature_parameters()
         if list(params.items())[0][0] == "self":
             temp = list(params.items())
             temp.pop(0)
@@ -387,7 +387,7 @@ def parse_options(self, params) -> List[Option]:
         return final_options
 
     def _is_typing_union(self, annotation):
-        return getattr(annotation, "__origin__", None) is Union # type: ignore
+        return getattr(annotation, "__origin__", None) in (Union, getattr(types, "UnionType", Union)) # type: ignore
 
     def _is_typing_optional(self, annotation):
         return self._is_typing_union(annotation) and type(None) in annotation.__args__  # type: ignore

discord/ext/commands/core.py

@@ -44,6 +44,7 @@
 import functools
 import inspect
 import datetime
+import types
 
 import discord
 
@@ -1019,7 +1020,7 @@ def short_doc(self) -> str:
         return ''
 
     def _is_typing_optional(self, annotation: Union[T, Optional[T]]) -> TypeGuard[Optional[T]]:
-        return getattr(annotation, '__origin__', None) is Union and type(None) in annotation.__args__  # type: ignore
+        return getattr(annotation, '__origin__', None) in (Union, getattr(types, "UnionType", Union)) and type(None) in annotation.__args__  # type: ignore
 
     @property
     def signature(self) -> str: