#4829: better error message for invalid file mode

diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index ff278cfb1af103f9ce988bb0ad3fd6dec3a42437..74009e3657dd0aeab9b91fdef78ae87359d99271 100644 (file)
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -267,7 +267,8 @@ fileio_init(PyObject *oself, PyObject *args, PyObject *kwds)
             if (rwa) {
             bad_mode:
                 PyErr_SetString(PyExc_ValueError,
-                                "Must have exactly one of read/write/append mode");
+                                "Must have exactly one of read/write/append "
+                                "mode and at most one plus");
                 goto error;
             }
             rwa = 1;