Issue #28385: An error message when non-empty format spec is passed to
object.__format__ now contains the name of actual type.
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index cc312b1..3288a5b 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -1259,6 +1259,15 @@
self.assertEqual(f(b"'"), '''b"'"''') # '''
self.assertEqual(f(b"'\""), r"""b'\'"'""") # '
+ @check_bytes_warnings
+ def test_format(self):
+ for b in b'abc', bytearray(b'abc'):
+ self.assertEqual(format(b), str(b))
+ self.assertEqual(format(b, ''), str(b))
+ with self.assertRaisesRegex(TypeError,
+ r'\b%s\b' % re.escape(type(b).__name__)):
+ format(b, 's')
+
def test_compare_bytes_to_bytearray(self):
self.assertEqual(b"abc" == bytes(b"abc"), True)
self.assertEqual(b"ab" != bytes(b"abc"), True)