495 		return NULL;

   495 		return NULL;

   496 	}

   496 	}

   497 	if (self->format_version != format_v1) {

   497 	if (self->format_version != format_v1) {

   498 		PyErr_Format(PyExc_RuntimeError,

   498 		PyErr_Format(PyExc_RuntimeError,

   499 		             "version header should go in the docket, not the "

   499 		             "version header should go in the docket, not the "

   501 		             header);

   501 		             header);

   502 		return NULL;

   502 		return NULL;

   503 	}

   503 	}

   504 	putbe32(header, out);

   504 	putbe32(header, out);

   505 	return PyBytes_FromStringAndSize(out, 4);

   505 	return PyBytes_FromStringAndSize(out, 4);