From e5e99b4e386a3b2cefe79e2716f08c2c1c6043fd Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Tue, 27 Jun 2023 16:34:40 +0200
Subject: simdata/_DataDir: report which exactly key is missing

---
 simdata.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/simdata.py b/simdata.py
index ad42d0a..2464cb2 100644
--- a/simdata.py
+++ b/simdata.py
@@ -101,7 +101,7 @@ class _DataDir(MutableMapping):
 
     def __getitem__(self, key):
         if not key in self._paths:
-            raise KeyError
+            raise KeyError(key)
         elif self._files[key] is None:
             self._files[key] = datafile.DataFile(self._paths[key])
 
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