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gh-142787: Handle empty sqlite3 blob slices (#142824)

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A.Ibrahim 2026-02-26 23:40:25 +00:00 • committed by GitHub
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5
Lib/test/test_sqlite3/test_dbapi.py
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@ -1379,6 +1379,11 @@ 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("insert into test(b) values (?)", (b"abc",))
with self.cx.blobopen("test", "b", 2) 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])

2
Misc/NEWS.d/next/Library/2025-12-16-13-34-48.gh-issue-142787.wNitJX.rst Normal file
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@ -0,0 +1,2 @@
Fix assertion failure in :mod:`sqlite3` blob subscript when slicing with
indices that result in an empty slice.

4
Modules/_sqlite/blob.c
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@ -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);
}