Get rid of more PyArg_Parse & METH_OLDARGS.
  PyArg_Parse( "s" )  -> PyString_AsString
  PyArg_Parse( "t#" ) -> PyString_AsStringAndSize
diff --git a/Modules/structmodule.c b/Modules/structmodule.c
index df80302..bf871ee 100644
--- a/Modules/structmodule.c
+++ b/Modules/structmodule.c
@@ -1273,7 +1273,8 @@
 		return NULL;
 	}
 	format = PyTuple_GetItem(args, 0);
-	if (!PyArg_Parse(format, "s", &fmt))
+	fmt = PyString_AsString(format);
+	if (!fmt)
 		return NULL;
 	f = whichtable(&fmt);
 	size = calcsize(fmt, f);