Improve two classes which are namedtuples at runtime, but cannot be namedtuples in typeshed (#7429)

Author: AlexWaygood

stdlib/concurrent/futures/_base.pyi

@@ -79,8 +79,10 @@ def as_completed(fs: Iterable[Future[_T]], timeout: float | None = ...) -> Itera
 
 # Ideally this would be a namedtuple, but mypy doesn't support generic tuple types. See #1976
 class DoneAndNotDoneFutures(Sequence[set[Future[_T]]]):
-    done: set[Future[_T]]
-    not_done: set[Future[_T]]
+    @property
+    def done(self) -> set[Future[_T]]: ...
+    @property
+    def not_done(self) -> set[Future[_T]]: ...
     def __new__(_cls, done: set[Future[_T]], not_done: set[Future[_T]]) -> DoneAndNotDoneFutures[_T]: ...
     def __len__(self) -> int: ...
     @overload

stdlib/urllib/parse.pyi

@@ -64,8 +64,10 @@ class _NetlocResultMixinStr(_NetlocResultMixinBase[str], _ResultMixinStr): ...
 class _NetlocResultMixinBytes(_NetlocResultMixinBase[bytes], _ResultMixinBytes): ...
 
 class _DefragResultBase(tuple[Any, ...], Generic[AnyStr]):
-    url: AnyStr
-    fragment: AnyStr
+    @property
+    def url(self) -> AnyStr: ...
+    @property
+    def fragment(self) -> AnyStr: ...
 
 class _SplitResultBase(NamedTuple):
     scheme: str