This reverts r63675 based on the discussion in this thread:

 http://mail.python.org/pipermail/python-dev/2008-June/079988.html

Python 2.6 should stick with PyString_* in its codebase.  The PyBytes_* names
in the spirit of 3.0 are available via a #define only.  See the email thread.
diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
index b3ed673..da4356b 100644
--- a/Objects/rangeobject.c
+++ b/Objects/rangeobject.c
@@ -113,16 +113,16 @@
 	PyObject *rtn;
 
 	if (r->start == 0 && r->step == 1)
-		rtn = PyBytes_FromFormat("xrange(%ld)",
+		rtn = PyString_FromFormat("xrange(%ld)",
 					  r->start + r->len * r->step);
 
 	else if (r->step == 1)
-		rtn = PyBytes_FromFormat("xrange(%ld, %ld)",
+		rtn = PyString_FromFormat("xrange(%ld, %ld)",
 					  r->start,
 					  r->start + r->len * r->step);
 
 	else
-		rtn = PyBytes_FromFormat("xrange(%ld, %ld, %ld)",
+		rtn = PyString_FromFormat("xrange(%ld, %ld, %ld)",
 					  r->start,
 					  r->start + r->len * r->step,
 					  r->step);