From 97ca005b1d1eb360a796cb4bb238a57e96b2fc5d Mon Sep 17 00:00:00 2001
From: abdoulrasheed <abdulrasheedibrahim47@gmail.com>
Date: Tue, 16 Dec 2025 13:21:59 +0000
Subject: [PATCH 1/4] gh-142787: Fix assertion failure in sqlite3 blob slice

---
 .../Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst  | 2 ++
 Modules/_sqlite/blob.c                                        | 4 ++++
 2 files changed, 6 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst

diff --git a/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst b/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst
new file mode 100644
index 00000000000000..8238a1cde1b5c3
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst
@@ -0,0 +1,2 @@
+Fix assertion failure in :mod:`sqlite3` blob subscript when slicing with
+indices that result in an empty slice.
diff --git a/Modules/_sqlite/blob.c b/Modules/_sqlite/blob.c
index 4a213f348881b9..8dad94556236bd 100644
--- a/Modules/_sqlite/blob.c
+++ b/Modules/_sqlite/blob.c
@@ -439,6 +439,10 @@ subscript_slice(pysqlite_Blob *self, PyObject *item)
         return NULL;
     }
 
+    if (len == 0) {
+        return PyBytes_FromStringAndSize(NULL, 0);
+    }
+
     if (step == 1) {
         return read_multiple(self, len, start);
     }

From 577803cd6628cd1d7a68d785ab40de7991960c0f Mon Sep 17 00:00:00 2001
From: "blurb-it[bot]" <43283697+blurb-it[bot]@users.noreply.github.com>
Date: Tue, 16 Dec 2025 13:34:49 +0000
Subject: [PATCH 2/4] =?UTF-8?q?=F0=9F=93=9C=F0=9F=A4=96=20Added=20by=20blu?=
 =?UTF-8?q?rb=5Fit.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...slice.rst => 2025-12-16-13-34-48.gh-issue-142787.wNitJX.rst} | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename Misc/NEWS.d/next/Library/{2024-12-16-142787.gh-issue-142787.blob_slice.rst => 2025-12-16-13-34-48.gh-issue-142787.wNitJX.rst} (99%)

diff --git a/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst b/Misc/NEWS.d/next/Library/2025-12-16-13-34-48.gh-issue-142787.wNitJX.rst
similarity index 99%
rename from Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst
rename to Misc/NEWS.d/next/Library/2025-12-16-13-34-48.gh-issue-142787.wNitJX.rst
index 8238a1cde1b5c3..e928bd2cac72a8 100644
--- a/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst
+++ b/Misc/NEWS.d/next/Library/2025-12-16-13-34-48.gh-issue-142787.wNitJX.rst
@@ -1,2 +1,2 @@
-Fix assertion failure in :mod:`sqlite3` blob subscript when slicing with
+Fix assertion failure in :mod:`sqlite3` blob subscript when slicing with
 indices that result in an empty slice.

From c7a12b3eee8765c7cc036feaec623d8ae34e7e44 Mon Sep 17 00:00:00 2001
From: abdoulrasheed <abdulrasheedibrahim47@gmail.com>
Date: Tue, 16 Dec 2025 13:56:38 +0000
Subject: [PATCH 3/4] Add regression test for gh-142787

---
 Lib/test/test_sqlite3/test_dbapi.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Lib/test/test_sqlite3/test_dbapi.py b/Lib/test/test_sqlite3/test_dbapi.py
index 20e39f61e4dedb..804f55f23241e8 100644
--- a/Lib/test/test_sqlite3/test_dbapi.py
+++ b/Lib/test/test_sqlite3/test_dbapi.py
@@ -1379,6 +1379,12 @@ def test_blob_get_slice(self):
     def test_blob_get_empty_slice(self):
         self.assertEqual(self.blob[5:5], b"")
 
+    def test_blob_get_empty_slice_oob_indices(self):
+        self.cx.execute("delete from test")
+        self.cx.execute("insert into test(b) values (?)", (b"abc",))
+        with self.cx.blobopen("test", "b", 1) as blob:
+            self.assertEqual(blob[5:-5], b"")
+
     def test_blob_get_slice_negative_index(self):
         self.assertEqual(self.blob[5:-5], self.data[5:-5])
 

From e1556e87461729524cce9e5e600d2ad700c6445a Mon Sep 17 00:00:00 2001
From: abdoulrasheed <abdulrasheedibrahim47@gmail.com>
Date: Tue, 16 Dec 2025 18:37:12 +0000
Subject: [PATCH 4/4] Update test: insert new row instead of deleting

---
 Lib/test/test_sqlite3/test_dbapi.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Lib/test/test_sqlite3/test_dbapi.py b/Lib/test/test_sqlite3/test_dbapi.py
index 804f55f23241e8..73b40e82a96811 100644
--- a/Lib/test/test_sqlite3/test_dbapi.py
+++ b/Lib/test/test_sqlite3/test_dbapi.py
@@ -1380,9 +1380,8 @@ def test_blob_get_empty_slice(self):
         self.assertEqual(self.blob[5:5], b"")
 
     def test_blob_get_empty_slice_oob_indices(self):
-        self.cx.execute("delete from test")
         self.cx.execute("insert into test(b) values (?)", (b"abc",))
-        with self.cx.blobopen("test", "b", 1) as blob:
+        with self.cx.blobopen("test", "b", 2) as blob:
             self.assertEqual(blob[5:-5], b"")
 
     def test_blob_get_slice_negative_index(self):