tjh.dev
nixpkgs mirror (for testing)
github.com/NixOS/nixpkgs
nix
1From 9be2b65dbd8366da27cd79c09195493217dbf539 Mon Sep 17 00:00:00 2001
2From: Tom Hunze <dev@thunze.de>
3Date: Sat, 7 Feb 2026 11:37:49 +0100
4Subject: [PATCH] Fix `ExceptionGroup` repr changing when original exception
5 sequence is mutated
6
7https://github.com/python/cpython/pull/141736
8---
9 src/exceptiongroup/_exceptions.py | 3 ++-
10 tests/test_exceptions.py | 3 +--
11 2 files changed, 3 insertions(+), 3 deletions(-)
12
13diff --git a/src/exceptiongroup/_exceptions.py b/src/exceptiongroup/_exceptions.py
14index f42c1ad..996d8e1 100644
15--- a/src/exceptiongroup/_exceptions.py
16+++ b/src/exceptiongroup/_exceptions.py
17@@ -101,6 +101,7 @@ class BaseExceptionGroup(BaseException, Generic[_BaseExceptionT_co]):
18 )
19
20 instance = super().__new__(cls, __message, __exceptions)
21+ instance._exceptions_str = repr(__exceptions)
22 instance._exceptions = tuple(__exceptions)
23 return instance
24
25@@ -275,7 +276,7 @@ class BaseExceptionGroup(BaseException, Generic[_BaseExceptionT_co]):
26 return f"{self.message} ({len(self._exceptions)} sub-exception{suffix})"
27
28 def __repr__(self) -> str:
29- return f"{self.__class__.__name__}({self.args[0]!r}, {self.args[1]!r})"
30+ return f"{self.__class__.__name__}({self.args[0]!r}, {self._exceptions_str})"
31
32
33 class ExceptionGroup(BaseExceptionGroup[_ExceptionT_co], Exception):
34diff --git a/tests/test_exceptions.py b/tests/test_exceptions.py
35index e2bc81a..a253236 100644
36--- a/tests/test_exceptions.py
37+++ b/tests/test_exceptions.py
38@@ -883,6 +883,5 @@ def test_exceptions_mutate_original_sequence():
39 exceptions.append(KeyError("bar"))
40 assert excgrp.exceptions is exc_tuple
41 assert repr(excgrp) == (
42- "BaseExceptionGroup('foo', [ValueError(1), KeyboardInterrupt(), "
43- "KeyError('bar')])"
44+ "BaseExceptionGroup('foo', [ValueError(1), KeyboardInterrupt()])"
45 )
46--
472.51.2
48