From 359d4c095ddb3cc7a67f418a6685e1b094cb3825 Mon Sep 17 00:00:00 2001
From: Thomas M Kehrenberg <tmke8@posteo.net>
Date: Tue, 7 Nov 2023 12:49:39 +0100
Subject: [PATCH] Fix return type of dbm.whichdb (#10989)

It is `None` if the given file doesn't exist or isn't a database.
---
 stdlib/dbm/__init__.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/dbm/__init__.pyi b/stdlib/dbm/__init__.pyi
index 0068d67b6..d71155288 100644
--- a/stdlib/dbm/__init__.pyi
+++ b/stdlib/dbm/__init__.pyi
@@ -90,5 +90,5 @@ class _error(Exception): ...
 
 error: tuple[type[_error], type[OSError]]
 
-def whichdb(filename: str) -> str: ...
+def whichdb(filename: str) -> str | None: ...
 def open(file: str, flag: _TFlags = "r", mode: int = 0o666) -> _Database: ...