From add0b5e930a1db16560fde45a3b710eefc625709 Mon Sep 17 00:00:00 2001
From: Sebastian Rittau <srittau@rittau.biz>
Date: Wed, 6 Nov 2019 16:21:32 +0100
Subject: [PATCH] Add functools.cached_property (#3439)

Part of #3319
---
 stdlib/3/functools.pyi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/stdlib/3/functools.pyi b/stdlib/3/functools.pyi
index 78a3466ea..a23ef6f5f 100644
--- a/stdlib/3/functools.pyi
+++ b/stdlib/3/functools.pyi
@@ -76,3 +76,14 @@ class _SingleDispatchCallable(Generic[_T]):
     def __call__(self, *args: Any, **kwargs: Any) -> _T: ...
 
 def singledispatch(func: Callable[..., _T]) -> _SingleDispatchCallable[_T]: ...
+
+if sys.version_info >= (3, 8):
+    class cached_property(Generic[_S, _T]):
+        func: Callable[[_S], _T]
+        attrname: Optional[str]
+        def __init__(self, func: Callable[[_S], _T]) -> None: ...
+        @overload
+        def __get__(self, instance: None, owner: Optional[Type[_S]] = ...) -> cached_property[_S, _T]: ...
+        @overload
+        def __get__(self, instance: _S, owner: Optional[Type[_S]] = ...) -> _T: ...
+        def __set_name__(self, owner: Type[_S], name: str) -> None: ...