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/Modules/_sqlite/cache.c b/Modules/_sqlite/cache.c
index 3362a5c..85118fc 100644
--- a/Modules/_sqlite/cache.c
+++ b/Modules/_sqlite/cache.c
@@ -241,12 +241,12 @@
         if (!fmt_args) {
             return NULL;
         }
-        template = PyBytes_FromString("%s <- %s ->%s\n");
+        template = PyString_FromString("%s <- %s ->%s\n");
         if (!template) {
             Py_DECREF(fmt_args);
             return NULL;
         }
-        display_str = PyBytes_Format(template, fmt_args);
+        display_str = PyString_Format(template, fmt_args);
         Py_DECREF(template);
         Py_DECREF(fmt_args);
         if (!display_str) {