Issue #1583863: An unicode subclass can now override the __str__ method
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index a859c0f..973a008 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1193,6 +1193,17 @@
self.assertRaises(MemoryError, alloc)
self.assertRaises(MemoryError, alloc)
+ def test_format_subclass(self):
+ class U(unicode):
+ def __str__(self):
+ return '__str__ overridden'
+ def __unicode__(self):
+ return u'__unicode__ overridden'
+ u = U(u'xxx')
+ self.assertEquals("%s" % u, u'__unicode__ overridden')
+ self.assertEquals("{}".format(u), u'__unicode__ overridden')
+
+
def test_main():
test_support.run_unittest(__name__)