From 96ad09c55919d1ce4844c7f89c422a44b8b6bd8e Mon Sep 17 00:00:00 2001
From: Arie Bovenberg <a.c.bovenberg@gmail.com>
Date: Sun, 2 May 2021 15:39:11 +0200
Subject: [PATCH] fix date.isocalendar() to return namedtuple on py39+ (#5302)

---
 stdlib/datetime.pyi | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/stdlib/datetime.pyi b/stdlib/datetime.pyi
index 5cfb42b32..4692f590b 100644
--- a/stdlib/datetime.pyi
+++ b/stdlib/datetime.pyi
@@ -1,6 +1,6 @@
 import sys
 from time import struct_time
-from typing import AnyStr, ClassVar, Optional, SupportsAbs, Tuple, Type, TypeVar, Union, overload
+from typing import AnyStr, ClassVar, NamedTuple, Optional, SupportsAbs, Tuple, Type, TypeVar, Union, overload
 
 _S = TypeVar("_S")
 
@@ -26,6 +26,12 @@ if sys.version_info >= (3, 2):
         def __init__(self, offset: timedelta, name: str = ...) -> None: ...
         def __hash__(self) -> int: ...
 
+if sys.version_info >= (3, 9):
+    class _IsoCalendarDate(NamedTuple):
+        year: int
+        week: int
+        weekday: int
+
 _tzinfo = tzinfo
 
 class date:
@@ -78,7 +84,10 @@ class date:
     def __hash__(self) -> int: ...
     def weekday(self) -> int: ...
     def isoweekday(self) -> int: ...
-    def isocalendar(self) -> Tuple[int, int, int]: ...
+    if sys.version_info >= (3, 9):
+        def isocalendar(self) -> _IsoCalendarDate: ...
+    else:
+        def isocalendar(self) -> Tuple[int, int, int]: ...
 
 class time:
     min: ClassVar[time]
@@ -370,4 +379,7 @@ class datetime(date):
     def __hash__(self) -> int: ...
     def weekday(self) -> int: ...
     def isoweekday(self) -> int: ...
-    def isocalendar(self) -> Tuple[int, int, int]: ...
+    if sys.version_info >= (3, 9):
+        def isocalendar(self) -> _IsoCalendarDate: ...
+    else:
+        def isocalendar(self) -> Tuple[int, int, int]: ...