diff -r 953d8ec1aeb3 Objects/unicodeobject.c
--- a/Objects/unicodeobject.c	Sat Dec 14 21:07:51 2013 +0200
+++ b/Objects/unicodeobject.c	Sun Dec 15 13:16:54 2013 +0800
@@ -2622,6 +2622,15 @@
         break;
     }
 
+    case 'T':
+    {
+        /* %.400s */
+        const char *s = va_arg(*vargs, const char*);
+        if (unicode_fromformat_write_cstr(writer, s, 0, 400) < 0)
+            return NULL;
+        break;
+    }
+
     case 'U':
     {
         PyObject *obj = va_arg(*vargs, PyObject *);