From a1cab28debf9c9794bbded7123620ae4545abd28 Mon Sep 17 00:00:00 2001
From: donBarbos <donbarbos@proton.me>
Date: Fri, 18 Jul 2025 22:06:14 +0400
Subject: [PATCH 1/2] [argparse] Deprecate `prefix_chars` in
 `ArgumentParser.add_argument_group`

Source: https://github.com/python/cpython/pull/125563
---
 stdlib/argparse.pyi | 44 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/stdlib/argparse.pyi b/stdlib/argparse.pyi
index 312093c0aa55..e9bb7fbc0458 100644
--- a/stdlib/argparse.pyi
+++ b/stdlib/argparse.pyi
@@ -495,16 +495,40 @@ else:
 class _ArgumentGroup(_ActionsContainer):
     title: str | None
     _group_actions: list[Action]
-    def __init__(
-        self,
-        container: _ActionsContainer,
-        title: str | None = None,
-        description: str | None = None,
-        *,
-        prefix_chars: str = ...,
-        argument_default: Any = ...,
-        conflict_handler: str = ...,
-    ) -> None: ...
+    if sys.version_info >= (3, 14):
+        @overload
+        def __init__(
+            self,
+            container: _ActionsContainer,
+            title: str | None = None,
+            description: str | None = None,
+            *,
+            argument_default: Any = ...,
+            conflict_handler: str = ...,
+        ) -> None: ...
+        @overload
+        @deprecated("Undocumented `prefix_chars` parameter is deprecated since Python 3.14.")
+        def __init__(
+            self,
+            container: _ActionsContainer,
+            title: str | None = None,
+            description: str | None = None,
+            *,
+            prefix_chars: str = ...,
+            argument_default: Any = ...,
+            conflict_handler: str = ...,
+        ) -> None: ...
+    else:
+        def __init__(
+            self,
+            container: _ActionsContainer,
+            title: str | None = None,
+            description: str | None = None,
+            *,
+            prefix_chars: str = ...,
+            argument_default: Any = ...,
+            conflict_handler: str = ...,
+        ) -> None: ...
 
 # undocumented
 class _MutuallyExclusiveGroup(_ArgumentGroup):

From 0d8ec4081a2282b26650d82abb73a546056a8359 Mon Sep 17 00:00:00 2001
From: Semyon Moroz <donbarbos@proton.me>
Date: Fri, 18 Jul 2025 18:14:32 +0000
Subject: [PATCH 2/2] Update stdlib/argparse.pyi

Co-authored-by: Sebastian Rittau <srittau@rittau.biz>
---
 stdlib/argparse.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/argparse.pyi b/stdlib/argparse.pyi
index e9bb7fbc0458..00a4c670eaee 100644
--- a/stdlib/argparse.pyi
+++ b/stdlib/argparse.pyi
@@ -514,7 +514,7 @@ class _ArgumentGroup(_ActionsContainer):
             title: str | None = None,
             description: str | None = None,
             *,
-            prefix_chars: str = ...,
+            prefix_chars: str,
             argument_default: Any = ...,
             conflict_handler: str = ...,
         ) -> None: ...