Add support for UnionType in get_args (#87)

test_typing_inspect.py

@@ -438,6 +438,10 @@ def test_args_evaluated(self):
             # This would return (~T,) before Python 3.9.
             self.assertEqual(get_args(List), ())
 
+        if sys.version_info >= (3, 10):
+            self.assertEqual(get_args(int | str), (int, str))
+            self.assertEqual(get_args((int | tuple[T, int])[str]), (int, tuple[str, int]))
+
     def test_bound(self):
         T = TypeVar('T')
         TB = TypeVar('TB', bound=int)

typing_inspect.py

@@ -223,6 +223,8 @@ def is_union_type(tp):
         is_union_type(Union) == True
         is_union_type(Union[int, int]) == False
         is_union_type(Union[T, int]) == True
+        is_union_type(int | int) == False
+        is_union_type(T | int) == True
     """
     if NEW_TYPING:
         return (tp is Union or
@@ -512,6 +514,8 @@ def get_args(tp, evaluate=None):
             if get_origin(tp) is collections.abc.Callable and res[0] is not Ellipsis:
                 res = (list(res[:-1]), res[-1])
             return res
+        if MaybeUnionType and isinstance(tp, MaybeUnionType):
+            return tp.__args__
         return ()
     if is_classvar(tp) or is_final_type(tp):
         return (tp.__type__,) if tp.__type__ is not None else ()