bpo-42924: Fix incorrect copy in bytearray_repeat (GH-24208)
Before, using the * operator to repeat a bytearray would copy data from the start of
the internal buffer (ob_bytes) and not from the start of the actual data (ob_start).
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index d550abf..381030f 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -1666,6 +1666,16 @@ def test_iterator_length_hint(self):
# Shouldn't raise an error
self.assertEqual(list(it), [])
+ def test_repeat_after_setslice(self):
+ # bpo-42924: * used to copy from the wrong memory location
+ b = bytearray(b'abc')
+ b[:2] = b'x'
+ b1 = b * 1
+ b3 = b * 3
+ self.assertEqual(b1, b'xc')
+ self.assertEqual(b1, b)
+ self.assertEqual(b3, b'xcxcxc')
+
class AssortedBytesTest(unittest.TestCase):
#