From 8ecb8962e33930dd56d72004a59336d4b00fce22 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 5 Jul 2024 20:50:45 +0300
Subject: [PATCH] gh-121288: Make error message for index() methods consistent
 (GH-121395)

Make error message for index() methods consistent

Remove the repr of the searched value (which can be arbitrary large)
from ValueError messages for list.index(), range.index(), deque.index(),
deque.remove() and ShareableList.index().  Make the error messages
consistent with error messages for other index() and remove()
methods.
---
 Lib/multiprocessing/shared_memory.py                         | 2 +-
 .../2024-07-05-11-29-27.gh-issue-121288.lYKYYP.rst           | 5 +++++
 Modules/_collectionsmodule.c                                 | 4 ++--
 Objects/listobject.c                                         | 2 +-
 Objects/rangeobject.c                                        | 2 +-
 5 files changed, 10 insertions(+), 5 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2024-07-05-11-29-27.gh-issue-121288.lYKYYP.rst

diff --git a/Lib/multiprocessing/shared_memory.py b/Lib/multiprocessing/shared_memory.py
index 67e70fdc27cf..99a8ce3320ad 100644
--- a/Lib/multiprocessing/shared_memory.py
+++ b/Lib/multiprocessing/shared_memory.py
@@ -539,6 +539,6 @@ class ShareableList:
             if value == entry:
                 return position
         else:
-            raise ValueError(f"{value!r} not in this container")
+            raise ValueError("ShareableList.index(x): x not in list")
 
     __class_getitem__ = classmethod(types.GenericAlias)
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-07-05-11-29-27.gh-issue-121288.lYKYYP.rst b/Misc/NEWS.d/next/Core and Builtins/2024-07-05-11-29-27.gh-issue-121288.lYKYYP.rst
new file mode 100644
index 000000000000..bd3e20b56585
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-07-05-11-29-27.gh-issue-121288.lYKYYP.rst	
@@ -0,0 +1,5 @@
+:exc:`ValueError` messages for :meth:`!list.index()`, :meth:`!range.index()`,
+:meth:`!deque.index()`, :meth:`!deque.remove()` and
+:meth:`!ShareableList.index()` no longer contain the repr of the searched
+value (which can be arbitrary large) and are consistent with error messages
+for other :meth:`!index()` and :meth:`!remove()` methods.
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 0bc61db4117c..fbfed59995c2 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1293,7 +1293,7 @@ deque_index_impl(dequeobject *deque, PyObject *v, Py_ssize_t start,
             index = 0;
         }
     }
-    PyErr_Format(PyExc_ValueError, "%R is not in deque", v);
+    PyErr_SetString(PyExc_ValueError, "deque.index(x): x not in deque");
     return NULL;
 }
 
@@ -1462,7 +1462,7 @@ deque_remove_impl(dequeobject *deque, PyObject *value)
         }
     }
     if (i == n) {
-        PyErr_Format(PyExc_ValueError, "%R is not in deque", value);
+        PyErr_SetString(PyExc_ValueError, "deque.remove(x): x not in deque");
         return NULL;
     }
     rv = deque_del_item(deque, i);
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 9eae9626f7c1..f29f58dc25be 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -3244,7 +3244,7 @@ list_index_impl(PyListObject *self, PyObject *value, Py_ssize_t start,
         else if (cmp < 0)
             return NULL;
     }
-    PyErr_Format(PyExc_ValueError, "%R is not in list", value);
+    PyErr_SetString(PyExc_ValueError, "list.index(x): x not in list");
     return NULL;
 }
 
diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
index d5db48c14332..9727b4f47b53 100644
--- a/Objects/rangeobject.c
+++ b/Objects/rangeobject.c
@@ -655,7 +655,7 @@ range_index(rangeobject *r, PyObject *ob)
     }
 
     /* object is not in the range */
-    PyErr_Format(PyExc_ValueError, "%R is not in range", ob);
+    PyErr_SetString(PyExc_ValueError, "range.index(x): x not in range");
     return NULL;
 }
 
-- 
2.47.3