From 2a502d8304cdb92109a35ad32a3bfa4fe246d84f Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Fri, 24 Jul 1998 19:53:54 +0000
Subject: Use 'S' format character for the optional constructor argument, so we
 get a decent error message when it's not a string (instead of confusing
 errors when trying to use the thing).

---
 Modules/cStringIO.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index 2d7c940..494d895 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -565,7 +565,7 @@ static PyObject *
 IO_StringIO(PyObject *self, PyObject *args) {
   PyObject *s=0;
 
-  UNLESS(PyArg_ParseTuple(args, "|O", &s)) return NULL;
+  UNLESS(PyArg_ParseTuple(args, "|S", &s)) return NULL;
   if(s) return newIobject(s);
   return newOobject(128);
 }
-- 
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