bail in unicode error's __str__ methods if the objects are not properly initialized (closes #21134)
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index a485cba..7f55aab 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -431,6 +431,12 @@
u.start = 1000
self.assertEqual(str(u), "can't translate characters in position 1000-4: 965230951443685724997")
+ def test_unicode_errors_no_object(self):
+ # See issue #21134.
+ klasses = UnicodeDecodeError, UnicodeDecodeError, UnicodeTranslateError
+ for klass in klasses:
+ self.assertEqual(str(klass.__new__(klass)), "")
+
def test_badisinstance(self):
# Bug #2542: if issubclass(e, MyException) raises an exception,
# it should be ignored