bpo-37337: Add _PyObject_CallMethodNoArgs() (GH-14267)

Doc/c-api/object.rst

@@ -364,6 +364,17 @@ Object Protocol
    *NULL* on failure.
 
 
+.. c:function:: PyObject* _PyObject_CallMethodNoArgs(PyObject *obj, PyObject *name)
+
+   Call a method of the Python object *obj* without arguments,
+   where the name of the method is given as a Python string object in *name*.
+
+   Return the result of the call on success, or raise an exception and return
+   *NULL* on failure.
+
+   .. versionadded:: 3.9
+
+
 .. c:function:: PyObject* _PyObject_Vectorcall(PyObject *callable, PyObject *const *args, size_t nargsf, PyObject *kwnames)
 
    Call a callable Python object *callable*, using

Include/cpython/abstract.h

@@ -156,6 +156,13 @@ PyAPI_FUNC(PyObject *) _PyObject_VectorcallMethod(
     PyObject *name, PyObject *const *args,
     size_t nargsf, PyObject *kwnames);
 
+static inline PyObject *
+_PyObject_CallMethodNoArgs(PyObject *self, PyObject *name)
+{
+    return _PyObject_VectorcallMethod(name, &self,
+           1 | PY_VECTORCALL_ARGUMENTS_OFFSET, NULL);
+}
+
 /* Like PyObject_CallMethod(), but expect a _Py_Identifier*
    as the method name. */
 PyAPI_FUNC(PyObject *) _PyObject_CallMethodId(PyObject *obj,
@@ -184,6 +191,13 @@ _PyObject_VectorcallMethodId(
     return _PyObject_VectorcallMethod(oname, args, nargsf, kwnames);
 }
 
+static inline PyObject *
+_PyObject_CallMethodIdNoArgs(PyObject *self, _Py_Identifier *name)
+{
+    return _PyObject_VectorcallMethodId(name, &self,
+           1 | PY_VECTORCALL_ARGUMENTS_OFFSET, NULL);
+}
+
 PyAPI_FUNC(int) _PyObject_HasLen(PyObject *o);
 
 /* Guess the size of object 'o' using len(o) or o.__length_hint__().

Misc/NEWS.d/next/C API/2019-06-19-12-06-31.bpo-37337.gXIGyU.rst

@@ -1 +1,2 @@
-Add :c:func:`_PyObject_VectorcallMethod` for fast calling of methods.
+Add fast functions for calling methods: :c:func:`_PyObject_VectorcallMethod`
+and :c:func:`_PyObject_CallMethodNoArgs`

Modules/_asynciomodule.c

@@ -332,7 +332,7 @@ get_event_loop(void)
         return NULL;
     }
 
-    loop = _PyObject_CallMethodId(policy, &PyId_get_event_loop, NULL);
+    loop = _PyObject_CallMethodIdNoArgs(policy, &PyId_get_event_loop);
     Py_DECREF(policy);
     return loop;
 }
@@ -493,7 +493,7 @@ future_init(FutureObj *fut, PyObject *loop)
     }
     fut->fut_loop = loop;
 
-    res = _PyObject_CallMethodId(fut->fut_loop, &PyId_get_debug, NULL);
+    res = _PyObject_CallMethodIdNoArgs(fut->fut_loop, &PyId_get_debug);
     if (res == NULL) {
         return -1;
     }
@@ -1295,9 +1295,8 @@ FutureObj_repr(FutureObj *fut)
 
     ENSURE_FUTURE_ALIVE(fut)
 
-    PyObject *rinfo = _PyObject_CallMethodIdObjArgs((PyObject*)fut,
-                                                    &PyId__repr_info,
-                                                    NULL);
+    PyObject *rinfo = _PyObject_CallMethodIdNoArgs((PyObject*)fut,
+                                                   &PyId__repr_info);
     if (rinfo == NULL) {
         return NULL;
     }
@@ -2197,8 +2196,7 @@ _asyncio_Task_cancel_impl(TaskObj *self)
         PyObject *res;
         int is_true;
 
-        res = _PyObject_CallMethodId(
-            self->task_fut_waiter, &PyId_cancel, NULL);
+        res = _PyObject_CallMethodIdNoArgs(self->task_fut_waiter, &PyId_cancel);
         if (res == NULL) {
             return NULL;
         }
@@ -2735,7 +2733,7 @@ set_exception:
         if (task->task_must_cancel) {
             PyObject *r;
             int is_true;
-            r = _PyObject_CallMethodId(result, &PyId_cancel, NULL);
+            r = _PyObject_CallMethodIdNoArgs(result, &PyId_cancel);
             if (r == NULL) {
                 return NULL;
             }
@@ -2826,7 +2824,7 @@ set_exception:
         if (task->task_must_cancel) {
             PyObject *r;
             int is_true;
-            r = _PyObject_CallMethodId(result, &PyId_cancel, NULL);
+            r = _PyObject_CallMethodIdNoArgs(result, &PyId_cancel);
             if (r == NULL) {
                 return NULL;
             }

Modules/_collectionsmodule.c

@@ -2039,7 +2039,7 @@ defdict_reduce(defdictobject *dd, PyObject *Py_UNUSED(ignored))
         args = PyTuple_Pack(1, dd->default_factory);
     if (args == NULL)
         return NULL;
-    items = _PyObject_CallMethodId((PyObject *)dd, &PyId_items, NULL);
+    items = _PyObject_CallMethodIdNoArgs((PyObject *)dd, &PyId_items);
     if (items == NULL) {
         Py_DECREF(args);
         return NULL;

Modules/_ctypes/_ctypes.c

@@ -3974,7 +3974,7 @@ _build_result(PyObject *result, PyObject *callargs,
             _Py_IDENTIFIER(__ctypes_from_outparam__);
 
             v = PyTuple_GET_ITEM(callargs, i);
-            v = _PyObject_CallMethodId(v, &PyId___ctypes_from_outparam__, NULL);
+            v = _PyObject_CallMethodIdNoArgs(v, &PyId___ctypes_from_outparam__);
             if (v == NULL || numretvals == 1) {
                 Py_DECREF(callargs);
                 return v;

Modules/_cursesmodule.c

@@ -2906,7 +2906,7 @@ _curses_getwin(PyObject *module, PyObject *file)
     if (_Py_set_inheritable(fileno(fp), 0, NULL) < 0)
         goto error;
 
-    data = _PyObject_CallMethodId(file, &PyId_read, NULL);
+    data = _PyObject_CallMethodIdNoArgs(file, &PyId_read);
     if (data == NULL)
         goto error;
     if (!PyBytes_Check(data)) {

Modules/_datetimemodule.c

@@ -1659,7 +1659,7 @@ time_time(void)
     if (time != NULL) {
         _Py_IDENTIFIER(time);
 
-        result = _PyObject_CallMethodId(time, &PyId_time, NULL);
+        result = _PyObject_CallMethodIdNoArgs(time, &PyId_time);
         Py_DECREF(time);
     }
     return result;
@@ -1918,7 +1918,7 @@ get_float_as_integer_ratio(PyObject *floatobj)
     PyObject *ratio;
 
     assert(floatobj && PyFloat_Check(floatobj));
-    ratio = _PyObject_CallMethodId(floatobj, &PyId_as_integer_ratio, NULL);
+    ratio = _PyObject_CallMethodIdNoArgs(floatobj, &PyId_as_integer_ratio);
     if (ratio == NULL) {
         return NULL;
     }
@@ -3162,7 +3162,7 @@ date_isoformat(PyDateTime_Date *self, PyObject *Py_UNUSED(ignored))
 static PyObject *
 date_str(PyDateTime_Date *self)
 {
-    return _PyObject_CallMethodId((PyObject *)self, &PyId_isoformat, NULL);
+    return _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_isoformat);
 }
 
 
@@ -3188,7 +3188,7 @@ date_strftime(PyDateTime_Date *self, PyObject *args, PyObject *kw)
                                       &format))
         return NULL;
 
-    tuple = _PyObject_CallMethodId((PyObject *)self, &PyId_timetuple, NULL);
+    tuple = _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_timetuple);
     if (tuple == NULL)
         return NULL;
     result = wrap_strftime((PyObject *)self, format, tuple,
@@ -4175,7 +4175,7 @@ time_repr(PyDateTime_Time *self)
 static PyObject *
 time_str(PyDateTime_Time *self)
 {
-    return _PyObject_CallMethodId((PyObject *)self, &PyId_isoformat, NULL);
+    return _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_isoformat);
 }
 
 static PyObject *

Modules/_dbmmodule.c

@@ -370,7 +370,7 @@ static PyObject *
 dbm__exit__(PyObject *self, PyObject *args)
 {
     _Py_IDENTIFIER(close);
-    return _PyObject_CallMethodId(self, &PyId_close, NULL);
+    return _PyObject_CallMethodIdNoArgs(self, &PyId_close);
 }
 
 

Modules/_gdbmmodule.c

@@ -497,7 +497,7 @@ static PyObject *
 dbm__exit__(PyObject *self, PyObject *args)
 {
     _Py_IDENTIFIER(close);
-    return _PyObject_CallMethodId(self, &PyId_close, NULL);
+    return _PyObject_CallMethodIdNoArgs(self, &PyId_close);
 }
 
 static PyMethodDef dbm_methods[] = {

Modules/_io/_iomodule.c

@@ -400,7 +400,7 @@ _io_open_impl(PyObject *module, PyObject *file, const char *mode,
 
     /* buffering */
     if (buffering < 0) {
-        PyObject *res = _PyObject_CallMethodId(raw, &PyId_isatty, NULL);
+        PyObject *res = _PyObject_CallMethodIdNoArgs(raw, &PyId_isatty);
         if (res == NULL)
             goto error;
         isatty = PyLong_AsLong(res);
@@ -494,7 +494,7 @@ _io_open_impl(PyObject *module, PyObject *file, const char *mode,
     if (result != NULL) {
         PyObject *exc, *val, *tb, *close_result;
         PyErr_Fetch(&exc, &val, &tb);
-        close_result = _PyObject_CallMethodId(result, &PyId_close, NULL);
+        close_result = _PyObject_CallMethodIdNoArgs(result, &PyId_close);
         _PyErr_ChainExceptions(exc, val, tb);
         Py_XDECREF(close_result);
         Py_DECREF(result);

Modules/_io/bufferedio.c

@@ -461,7 +461,7 @@ static PyObject *
 buffered_simple_flush(buffered *self, PyObject *args)
 {
     CHECK_INITIALIZED(self)
-    return PyObject_CallMethodObjArgs(self->raw, _PyIO_str_flush, NULL);
+    return _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_flush);
 }
 
 static int
@@ -513,7 +513,7 @@ buffered_close(buffered *self, PyObject *args)
     }
     /* flush() will most probably re-take the lock, so drop it first */
     LEAVE_BUFFERED(self)
-    res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL);
+    res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_flush);
     if (!ENTER_BUFFERED(self))
         return NULL;
     if (res == NULL)
@@ -521,7 +521,7 @@ buffered_close(buffered *self, PyObject *args)
     else
         Py_DECREF(res);
 
-    res = PyObject_CallMethodObjArgs(self->raw, _PyIO_str_close, NULL);
+    res = _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_close);
 
     if (self->buffer) {
         PyMem_Free(self->buffer);
@@ -545,7 +545,7 @@ buffered_detach(buffered *self, PyObject *Py_UNUSED(ignored))
 {
     PyObject *raw, *res;
     CHECK_INITIALIZED(self)
-    res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL);
+    res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_flush);
     if (res == NULL)
         return NULL;
     Py_DECREF(res);
@@ -562,21 +562,21 @@ static PyObject *
 buffered_seekable(buffered *self, PyObject *Py_UNUSED(ignored))
 {
     CHECK_INITIALIZED(self)
-    return PyObject_CallMethodObjArgs(self->raw, _PyIO_str_seekable, NULL);
+    return _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_seekable);
 }
 
 static PyObject *
 buffered_readable(buffered *self, PyObject *Py_UNUSED(ignored))
 {
     CHECK_INITIALIZED(self)
-    return PyObject_CallMethodObjArgs(self->raw, _PyIO_str_readable, NULL);
+    return _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_readable);
 }
 
 static PyObject *
 buffered_writable(buffered *self, PyObject *Py_UNUSED(ignored))
 {
     CHECK_INITIALIZED(self)
-    return PyObject_CallMethodObjArgs(self->raw, _PyIO_str_writable, NULL);
+    return _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_writable);
 }
 
 static PyObject *
@@ -599,14 +599,14 @@ static PyObject *
 buffered_fileno(buffered *self, PyObject *Py_UNUSED(ignored))
 {
     CHECK_INITIALIZED(self)
-    return PyObject_CallMethodObjArgs(self->raw, _PyIO_str_fileno, NULL);
+    return _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_fileno);
 }
 
 static PyObject *
 buffered_isatty(buffered *self, PyObject *Py_UNUSED(ignored))
 {
     CHECK_INITIALIZED(self)
-    return PyObject_CallMethodObjArgs(self->raw, _PyIO_str_isatty, NULL);
+    return _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_isatty);
 }
 
 /* Forward decls */
@@ -670,7 +670,7 @@ _buffered_raw_tell(buffered *self)
 {
     Py_off_t n;
     PyObject *res;
-    res = PyObject_CallMethodObjArgs(self->raw, _PyIO_str_tell, NULL);
+    res = _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_tell);
     if (res == NULL)
         return -1;
     n = PyNumber_AsOff_t(res, PyExc_ValueError);
@@ -1350,8 +1350,8 @@ buffered_iternext(buffered *self)
         line = _buffered_readline(self, -1);
     }
     else {
-        line = PyObject_CallMethodObjArgs((PyObject *)self,
-                                           _PyIO_str_readline, NULL);
+        line = _PyObject_CallMethodNoArgs((PyObject *)self,
+                                             _PyIO_str_readline);
         if (line && !PyBytes_Check(line)) {
             PyErr_Format(PyExc_OSError,
                          "readline() should have returned a bytes object, "
@@ -1566,7 +1566,7 @@ _bufferedreader_read_all(buffered *self)
         }
 
         /* Read until EOF or until read() would block. */
-        data = PyObject_CallMethodObjArgs(self->raw, _PyIO_str_read, NULL);
+        data = _PyObject_CallMethodNoArgs(self->raw, _PyIO_str_read);
         if (data == NULL)
             goto cleanup;
         if (data != Py_None && !PyBytes_Check(data)) {

Modules/_io/iobase.c

@@ -235,7 +235,7 @@ _io__IOBase_close_impl(PyObject *self)
         Py_RETURN_NONE;
     }
 
-    res = PyObject_CallMethodObjArgs(self, _PyIO_str_flush, NULL);
+    res = _PyObject_CallMethodNoArgs(self, _PyIO_str_flush);
 
     PyErr_Fetch(&exc, &val, &tb);
     rc = _PyObject_SetAttrId(self, &PyId___IOBase_closed, Py_True);
@@ -281,8 +281,7 @@ iobase_finalize(PyObject *self)
            finalization process. */
         if (_PyObject_SetAttrId(self, &PyId__finalizing, Py_True))
             PyErr_Clear();
-        res = PyObject_CallMethodObjArgs((PyObject *) self, _PyIO_str_close,
-                                          NULL);
+        res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_close);
         /* Silencing I/O errors is bad, but printing spurious tracebacks is
            equally as bad, and potentially more frequent (because of
            shutdown issues). */
@@ -383,7 +382,7 @@ _io__IOBase_seekable_impl(PyObject *self)
 PyObject *
 _PyIOBase_check_seekable(PyObject *self, PyObject *args)
 {
-    PyObject *res  = PyObject_CallMethodObjArgs(self, _PyIO_str_seekable, NULL);
+    PyObject *res  = _PyObject_CallMethodNoArgs(self, _PyIO_str_seekable);
     if (res == NULL)
         return NULL;
     if (res != Py_True) {
@@ -416,7 +415,7 @@ _io__IOBase_readable_impl(PyObject *self)
 PyObject *
 _PyIOBase_check_readable(PyObject *self, PyObject *args)
 {
-    PyObject *res  = PyObject_CallMethodObjArgs(self, _PyIO_str_readable, NULL);
+    PyObject *res = _PyObject_CallMethodNoArgs(self, _PyIO_str_readable);
     if (res == NULL)
         return NULL;
     if (res != Py_True) {
@@ -449,7 +448,7 @@ _io__IOBase_writable_impl(PyObject *self)
 PyObject *
 _PyIOBase_check_writable(PyObject *self, PyObject *args)
 {
-    PyObject *res  = PyObject_CallMethodObjArgs(self, _PyIO_str_writable, NULL);
+    PyObject *res = _PyObject_CallMethodNoArgs(self, _PyIO_str_writable);
     if (res == NULL)
         return NULL;
     if (res != Py_True) {
@@ -478,7 +477,7 @@ iobase_enter(PyObject *self, PyObject *args)
 static PyObject *
 iobase_exit(PyObject *self, PyObject *args)
 {
-    return PyObject_CallMethodObjArgs(self, _PyIO_str_close, NULL);
+    return _PyObject_CallMethodNoArgs(self, _PyIO_str_close);
 }
 
 /* Lower-level APIs */
@@ -656,7 +655,7 @@ iobase_iter(PyObject *self)
 static PyObject *
 iobase_iternext(PyObject *self)
 {
-    PyObject *line = PyObject_CallMethodObjArgs(self, _PyIO_str_readline, NULL);
+    PyObject *line = _PyObject_CallMethodNoArgs(self, _PyIO_str_readline);
 
     if (line == NULL)
         return NULL;
@@ -921,7 +920,7 @@ _io__RawIOBase_read_impl(PyObject *self, Py_ssize_t n)
     if (n < 0) {
         _Py_IDENTIFIER(readall);
 
-        return _PyObject_CallMethodId(self, &PyId_readall, NULL);
+        return _PyObject_CallMethodIdNoArgs(self, &PyId_readall);
     }
 
     /* TODO: allocate a bytes object directly instead and manually construct

Modules/_io/stringio.c

@@ -408,8 +408,8 @@ stringio_iternext(stringio *self)
     }
     else {
         /* XXX is subclassing StringIO really supported? */
-        line = PyObject_CallMethodObjArgs((PyObject *)self,
-                                           _PyIO_str_readline, NULL);
+        line = _PyObject_CallMethodNoArgs((PyObject *)self,
+                                             _PyIO_str_readline);
         if (line && !PyUnicode_Check(line)) {
             PyErr_Format(PyExc_OSError,
                          "readline() should have returned a str object, "

Modules/_io/textio.c

@@ -527,8 +527,8 @@ _io_IncrementalNewlineDecoder_getstate_impl(nldecoder_object *self)
     unsigned long long flag;
 
     if (self->decoder != Py_None) {
-        PyObject *state = PyObject_CallMethodObjArgs(self->decoder,
-           _PyIO_str_getstate, NULL);
+        PyObject *state = _PyObject_CallMethodNoArgs(self->decoder,
+           _PyIO_str_getstate);
         if (state == NULL)
             return NULL;
         if (!PyTuple_Check(state)) {
@@ -601,7 +601,7 @@ _io_IncrementalNewlineDecoder_reset_impl(nldecoder_object *self)
     self->seennl = 0;
     self->pendingcr = 0;
     if (self->decoder != Py_None)
-        return PyObject_CallMethodObjArgs(self->decoder, _PyIO_str_reset, NULL);
+        return _PyObject_CallMethodNoArgs(self->decoder, _PyIO_str_reset);
     else
         Py_RETURN_NONE;
 }
@@ -862,7 +862,7 @@ _textiowrapper_set_decoder(textio *self, PyObject *codec_info,
     PyObject *res;
     int r;
 
-    res = _PyObject_CallMethodId(self->buffer, &PyId_readable, NULL);
+    res = _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_readable);
     if (res == NULL)
         return -1;
 
@@ -917,7 +917,7 @@ _textiowrapper_set_encoder(textio *self, PyObject *codec_info,
     PyObject *res;
     int r;
 
-    res = _PyObject_CallMethodId(self->buffer, &PyId_writable, NULL);
+    res = _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_writable);
     if (res == NULL)
         return -1;
 
@@ -963,8 +963,8 @@ _textiowrapper_fix_encoder_state(textio *self)
 
     self->encoding_start_of_stream = 1;
 
-    PyObject *cookieObj = PyObject_CallMethodObjArgs(
-        self->buffer, _PyIO_str_tell, NULL);
+    PyObject *cookieObj = _PyObject_CallMethodNoArgs(
+        self->buffer, _PyIO_str_tell);
     if (cookieObj == NULL) {
         return -1;
     }
@@ -1126,7 +1126,7 @@ _io_TextIOWrapper___init___impl(textio *self, PyObject *buffer,
         state = IO_STATE();
         if (state == NULL)
             goto error;
-        fileno = _PyObject_CallMethodId(buffer, &PyId_fileno, NULL);
+        fileno = _PyObject_CallMethodIdNoArgs(buffer, &PyId_fileno);
         /* Ignore only AttributeError and UnsupportedOperation */
         if (fileno == NULL) {
             if (PyErr_ExceptionMatches(PyExc_AttributeError) ||
@@ -1241,7 +1241,7 @@ _io_TextIOWrapper___init___impl(textio *self, PyObject *buffer,
         }
     }
 
-    res = _PyObject_CallMethodId(buffer, &PyId_seekable, NULL);
+    res = _PyObject_CallMethodIdNoArgs(buffer, &PyId_seekable);
     if (res == NULL)
         goto error;
     r = PyObject_IsTrue(res);
@@ -1386,7 +1386,7 @@ _io_TextIOWrapper_reconfigure_impl(textio *self, PyObject *encoding,
         return NULL;
     }
 
-    PyObject *res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL);
+    PyObject *res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_flush);
     if (res == NULL) {
         return NULL;
     }
@@ -1525,7 +1525,7 @@ _io_TextIOWrapper_detach_impl(textio *self)
 {
     PyObject *buffer, *res;
     CHECK_ATTACHED(self);
-    res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL);
+    res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_flush);
     if (res == NULL)
         return NULL;
     Py_DECREF(res);
@@ -1720,7 +1720,7 @@ _io_TextIOWrapper_write_impl(textio *self, PyObject *text)
     }
 
     if (needflush) {
-        ret = PyObject_CallMethodObjArgs(self->buffer, _PyIO_str_flush, NULL);
+        ret = _PyObject_CallMethodNoArgs(self->buffer, _PyIO_str_flush);
         if (ret == NULL)
             return NULL;
         Py_DECREF(ret);
@@ -1730,7 +1730,7 @@ _io_TextIOWrapper_write_impl(textio *self, PyObject *text)
     Py_CLEAR(self->snapshot);
 
     if (self->decoder) {
-        ret = _PyObject_CallMethodId(self->decoder, &PyId_reset, NULL);
+        ret = _PyObject_CallMethodIdNoArgs(self->decoder, &PyId_reset);
         if (ret == NULL)
             return NULL;
         Py_DECREF(ret);
@@ -1810,9 +1810,8 @@ textiowrapper_read_chunk(textio *self, Py_ssize_t size_hint)
         /* To prepare for tell(), we need to snapshot a point in the file
          * where the decoder's input buffer is empty.
          */
-
-        PyObject *state = PyObject_CallMethodObjArgs(self->decoder,
-                                                     _PyIO_str_getstate, NULL);
+        PyObject *state = _PyObject_CallMethodNoArgs(self->decoder,
+                                                     _PyIO_str_getstate);
         if (state == NULL)
             return -1;
         /* Given this, we know there was a valid snapshot point
@@ -1935,7 +1934,7 @@ _io_TextIOWrapper_read_impl(textio *self, Py_ssize_t n)
 
     if (n < 0) {
         /* Read everything */
-        PyObject *bytes = _PyObject_CallMethodId(self->buffer, &PyId_read, NULL);
+        PyObject *bytes = _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_read);
         PyObject *decoded;
         if (bytes == NULL)
             goto fail;
@@ -2396,7 +2395,7 @@ _textiowrapper_decoder_setstate(textio *self, cookie_type *cookie)
        utf-16, that we are expecting a BOM).
     */
     if (cookie->start_pos == 0 && cookie->dec_flags == 0)
-        res = PyObject_CallMethodObjArgs(self->decoder, _PyIO_str_reset, NULL);
+        res = _PyObject_CallMethodNoArgs(self->decoder, _PyIO_str_reset);
     else
         res = _PyObject_CallMethodId(self->decoder, &PyId_setstate,
                                      "((yi))", "", cookie->dec_flags);
@@ -2411,7 +2410,7 @@ _textiowrapper_encoder_reset(textio *self, int start_of_stream)
 {
     PyObject *res;
     if (start_of_stream) {
-        res = PyObject_CallMethodObjArgs(self->encoder, _PyIO_str_reset, NULL);
+        res = _PyObject_CallMethodNoArgs(self->encoder, _PyIO_str_reset);
         self->encoding_start_of_stream = 1;
     }
     else {
@@ -2476,7 +2475,7 @@ _io_TextIOWrapper_seek_impl(textio *self, PyObject *cookieObj, int whence)
          * sync the underlying buffer with the current position.
          */
         Py_DECREF(cookieObj);
-        cookieObj = _PyObject_CallMethodId((PyObject *)self, &PyId_tell, NULL);
+        cookieObj = _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_tell);
         if (cookieObj == NULL)
             goto fail;
         break;
@@ -2492,7 +2491,7 @@ _io_TextIOWrapper_seek_impl(textio *self, PyObject *cookieObj, int whence)
             goto fail;
         }
 
-        res = _PyObject_CallMethodId((PyObject *)self, &PyId_flush, NULL);
+        res = _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_flush);
         if (res == NULL)
             goto fail;
         Py_DECREF(res);
@@ -2500,7 +2499,7 @@ _io_TextIOWrapper_seek_impl(textio *self, PyObject *cookieObj, int whence)
         textiowrapper_set_decoded_chars(self, NULL);
         Py_CLEAR(self->snapshot);
         if (self->decoder) {
-            res = _PyObject_CallMethodId(self->decoder, &PyId_reset, NULL);
+            res = _PyObject_CallMethodIdNoArgs(self->decoder, &PyId_reset);
             if (res == NULL)
                 goto fail;
             Py_DECREF(res);
@@ -2540,7 +2539,7 @@ _io_TextIOWrapper_seek_impl(textio *self, PyObject *cookieObj, int whence)
         goto fail;
     }
 
-    res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL);
+    res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_flush);
     if (res == NULL)
         goto fail;
     Py_DECREF(res);
@@ -2663,12 +2662,12 @@ _io_TextIOWrapper_tell_impl(textio *self)
 
     if (_textiowrapper_writeflush(self) < 0)
         return NULL;
-    res = _PyObject_CallMethodId((PyObject *)self, &PyId_flush, NULL);
+    res = _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_flush);
     if (res == NULL)
         goto fail;
     Py_DECREF(res);
 
-    posobj = _PyObject_CallMethodId(self->buffer, &PyId_tell, NULL);
+    posobj = _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_tell);
     if (posobj == NULL)
         goto fail;
 
@@ -2704,15 +2703,15 @@ _io_TextIOWrapper_tell_impl(textio *self)
     chars_to_skip = self->decoded_chars_used;
 
     /* Decoder state will be restored at the end */
-    saved_state = PyObject_CallMethodObjArgs(self->decoder,
-                                             _PyIO_str_getstate, NULL);
+    saved_state = _PyObject_CallMethodNoArgs(self->decoder,
+                                             _PyIO_str_getstate);
     if (saved_state == NULL)
         goto fail;
 
 #define DECODER_GETSTATE() do { \
         PyObject *dec_buffer; \
-        PyObject *_state = PyObject_CallMethodObjArgs(self->decoder, \
-            _PyIO_str_getstate, NULL); \
+        PyObject *_state = _PyObject_CallMethodNoArgs(self->decoder, \
+            _PyIO_str_getstate); \
         if (_state == NULL) \
             goto fail; \
         if (!PyTuple_Check(_state)) { \
@@ -2874,7 +2873,7 @@ _io_TextIOWrapper_truncate_impl(textio *self, PyObject *pos)
 
     CHECK_ATTACHED(self)
 
-    res = PyObject_CallMethodObjArgs((PyObject *) self, _PyIO_str_flush, NULL);
+    res = _PyObject_CallMethodNoArgs((PyObject *)self, _PyIO_str_flush);
     if (res == NULL)
         return NULL;
     Py_DECREF(res);
@@ -2963,7 +2962,7 @@ _io_TextIOWrapper_fileno_impl(textio *self)
 /*[clinic end generated code: output=21490a4c3da13e6c input=c488ca83d0069f9b]*/
 {
     CHECK_ATTACHED(self);
-    return _PyObject_CallMethodId(self->buffer, &PyId_fileno, NULL);
+    return _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_fileno);
 }
 
 /*[clinic input]
@@ -2975,7 +2974,7 @@ _io_TextIOWrapper_seekable_impl(textio *self)
 /*[clinic end generated code: output=ab223dbbcffc0f00 input=8b005ca06e1fca13]*/
 {
     CHECK_ATTACHED(self);
-    return _PyObject_CallMethodId(self->buffer, &PyId_seekable, NULL);
+    return _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_seekable);
 }
 
 /*[clinic input]
@@ -2987,7 +2986,7 @@ _io_TextIOWrapper_readable_impl(textio *self)
 /*[clinic end generated code: output=72ff7ba289a8a91b input=0704ea7e01b0d3eb]*/
 {
     CHECK_ATTACHED(self);
-    return _PyObject_CallMethodId(self->buffer, &PyId_readable, NULL);
+    return _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_readable);
 }
 
 /*[clinic input]
@@ -2999,7 +2998,7 @@ _io_TextIOWrapper_writable_impl(textio *self)
 /*[clinic end generated code: output=a728c71790d03200 input=c41740bc9d8636e8]*/
 {
     CHECK_ATTACHED(self);
-    return _PyObject_CallMethodId(self->buffer, &PyId_writable, NULL);
+    return _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_writable);
 }
 
 /*[clinic input]
@@ -3011,7 +3010,7 @@ _io_TextIOWrapper_isatty_impl(textio *self)
 /*[clinic end generated code: output=12be1a35bace882e input=fb68d9f2c99bbfff]*/
 {
     CHECK_ATTACHED(self);
-    return _PyObject_CallMethodId(self->buffer, &PyId_isatty, NULL);
+    return _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_isatty);
 }
 
 /*[clinic input]
@@ -3027,7 +3026,7 @@ _io_TextIOWrapper_flush_impl(textio *self)
     self->telling = self->seekable;
     if (_textiowrapper_writeflush(self) < 0)
         return NULL;
-    return _PyObject_CallMethodId(self->buffer, &PyId_flush, NULL);
+    return _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_flush);
 }
 
 /*[clinic input]
@@ -3064,13 +3063,13 @@ _io_TextIOWrapper_close_impl(textio *self)
             else
                 PyErr_Clear();
         }
-        res = _PyObject_CallMethodId((PyObject *)self, &PyId_flush, NULL);
+        res = _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_flush);
         if (res == NULL)
             PyErr_Fetch(&exc, &val, &tb);
         else
             Py_DECREF(res);
 
-        res = _PyObject_CallMethodId(self->buffer, &PyId_close, NULL);
+        res = _PyObject_CallMethodIdNoArgs(self->buffer, &PyId_close);
         if (exc != NULL) {
             _PyErr_ChainExceptions(exc, val, tb);
             Py_CLEAR(res);
@@ -3092,8 +3091,8 @@ textiowrapper_iternext(textio *self)
         line = _textiowrapper_readline(self, -1);
     }
     else {
-        line = PyObject_CallMethodObjArgs((PyObject *)self,
-                                           _PyIO_str_readline, NULL);
+        line = _PyObject_CallMethodNoArgs((PyObject *)self,
+                                          _PyIO_str_readline);
         if (line && !PyUnicode_Check(line)) {
             PyErr_Format(PyExc_OSError,
                          "readline() should have returned a str object, "

Modules/_pickle.c

@@ -3305,7 +3305,7 @@ save_dict(PicklerObject *self, PyObject *obj)
         } else {
             _Py_IDENTIFIER(items);
 
-            items = _PyObject_CallMethodId(obj, &PyId_items, NULL);
+            items = _PyObject_CallMethodIdNoArgs(obj, &PyId_items);
             if (items == NULL)
                 goto error;
             iter = PyObject_GetIter(items);

Modules/_posixsubprocess.c

@@ -60,7 +60,7 @@ _enable_gc(int need_to_reenable_gc, PyObject *gc_module)
 
     if (need_to_reenable_gc) {
         PyErr_Fetch(&exctype, &val, &tb);
-        result = _PyObject_CallMethodId(gc_module, &PyId_enable, NULL);
+        result = _PyObject_CallMethodIdNoArgs(gc_module, &PyId_enable);
         if (exctype != NULL) {
             PyErr_Restore(exctype, val, tb);
         }
@@ -606,7 +606,7 @@ subprocess_fork_exec(PyObject* self, PyObject *args)
         gc_module = PyImport_ImportModule("gc");
         if (gc_module == NULL)
             return NULL;
-        result = _PyObject_CallMethodId(gc_module, &PyId_isenabled, NULL);
+        result = _PyObject_CallMethodIdNoArgs(gc_module, &PyId_isenabled);
         if (result == NULL) {
             Py_DECREF(gc_module);
             return NULL;
@@ -617,7 +617,7 @@ subprocess_fork_exec(PyObject* self, PyObject *args)
             Py_DECREF(gc_module);
             return NULL;
         }
-        result = _PyObject_CallMethodId(gc_module, &PyId_disable, NULL);
+        result = _PyObject_CallMethodIdNoArgs(gc_module, &PyId_disable);
         if (result == NULL) {
             Py_DECREF(gc_module);
             return NULL;

Modules/_sqlite/connection.c

@@ -713,7 +713,7 @@ void _pysqlite_final_callback(sqlite3_context* context)
     PyErr_Fetch(&exception, &value, &tb);
     restore = 1;
 
-    function_result = _PyObject_CallMethodId(*aggregate_instance, &PyId_finalize, NULL);
+    function_result = _PyObject_CallMethodIdNoArgs(*aggregate_instance, &PyId_finalize);
 
     Py_DECREF(*aggregate_instance);
 
@@ -1275,7 +1275,7 @@ PyObject* pysqlite_connection_execute(pysqlite_Connection* self, PyObject* args)
     PyObject* result = 0;
     PyObject* method = 0;
 
-    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, NULL);
+    cursor = _PyObject_CallMethodIdNoArgs((PyObject*)self, &PyId_cursor);
     if (!cursor) {
         goto error;
     }
@@ -1304,7 +1304,7 @@ PyObject* pysqlite_connection_executemany(pysqlite_Connection* self, PyObject* a
     PyObject* result = 0;
     PyObject* method = 0;
 
-    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, NULL);
+    cursor = _PyObject_CallMethodIdNoArgs((PyObject*)self, &PyId_cursor);
     if (!cursor) {
         goto error;
     }
@@ -1333,7 +1333,7 @@ PyObject* pysqlite_connection_executescript(pysqlite_Connection* self, PyObject*
     PyObject* result = 0;
     PyObject* method = 0;
 
-    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, NULL);
+    cursor = _PyObject_CallMethodIdNoArgs((PyObject*)self, &PyId_cursor);
     if (!cursor) {
         goto error;
     }

Modules/_sqlite/cursor.c

@@ -106,7 +106,7 @@ _pysqlite_get_converter(const char *keystr, Py_ssize_t keylen)
     if (!key) {
         return NULL;
     }
-    upcase_key = _PyObject_CallMethodId(key, &PyId_upper, NULL);
+    upcase_key = _PyObject_CallMethodIdNoArgs(key, &PyId_upper);
     Py_DECREF(key);
     if (!upcase_key) {
         return NULL;

Modules/_sqlite/module.c

@@ -203,7 +203,7 @@ static PyObject* module_register_converter(PyObject* self, PyObject* args)
     }
 
     /* convert the name to upper case */
-    name = _PyObject_CallMethodId(orig_name, &PyId_upper, NULL);
+    name = _PyObject_CallMethodIdNoArgs(orig_name, &PyId_upper);
     if (!name) {
         goto error;
     }

Modules/_threadmodule.c

@@ -1358,7 +1358,7 @@ thread_excepthook_file(PyObject *file, PyObject *exc_type, PyObject *exc_value,
     _PyErr_Display(file, exc_type, exc_value, exc_traceback);
 
     /* Call file.flush() */
-    PyObject *res = _PyObject_CallMethodId(file, &PyId_flush, NULL);
+    PyObject *res = _PyObject_CallMethodIdNoArgs(file, &PyId_flush);
     if (!res) {
         return -1;
     }

Modules/faulthandler.c

@@ -172,7 +172,7 @@ faulthandler_get_fileno(PyObject **file_ptr)
         return fd;
     }
 
-    result = _PyObject_CallMethodId(file, &PyId_fileno, NULL);
+    result = _PyObject_CallMethodIdNoArgs(file, &PyId_fileno);
     if (result == NULL)
         return -1;
 
@@ -190,7 +190,7 @@ faulthandler_get_fileno(PyObject **file_ptr)
         return -1;
     }
 
-    result = _PyObject_CallMethodId(file, &PyId_flush, NULL);
+    result = _PyObject_CallMethodIdNoArgs(file, &PyId_flush);
     if (result != NULL)
         Py_DECREF(result);
     else {
@@ -1305,7 +1305,7 @@ faulthandler_init_enable(void)
         return -1;
     }
 
-    PyObject *res = _PyObject_CallMethodId(module, &PyId_enable, NULL);
+    PyObject *res = _PyObject_CallMethodIdNoArgs(module, &PyId_enable);
     Py_DECREF(module);
     if (res == NULL) {
         return -1;

Modules/mmapmodule.c

@@ -692,7 +692,7 @@ mmap__exit__method(PyObject *self, PyObject *args)
 {
     _Py_IDENTIFIER(close);
 
-    return _PyObject_CallMethodId(self, &PyId_close, NULL);
+    return _PyObject_CallMethodIdNoArgs(self, &PyId_close);
 }
 
 #ifdef MS_WINDOWS

Modules/ossaudiodev.c

@@ -539,7 +539,7 @@ oss_exit(PyObject *self, PyObject *unused)
 {
     _Py_IDENTIFIER(close);
 
-    PyObject *ret = _PyObject_CallMethodId(self, &PyId_close, NULL);
+    PyObject *ret = _PyObject_CallMethodIdNoArgs(self, &PyId_close);
     if (!ret)
         return NULL;
     Py_DECREF(ret);

Modules/selectmodule.c

@@ -1634,7 +1634,7 @@ select_epoll___exit___impl(pyEpoll_Object *self, PyObject *exc_type,
 {
     _Py_IDENTIFIER(close);
 
-    return _PyObject_CallMethodId((PyObject *)self, &PyId_close, NULL);
+    return _PyObject_CallMethodIdNoArgs((PyObject *)self, &PyId_close);
 }
 
 static PyGetSetDef pyepoll_getsetlist[] = {

Objects/abstract.c

@@ -2221,7 +2221,7 @@ method_output_as_list(PyObject *o, _Py_Identifier *meth_id)
     PyObject *it, *result, *meth_output;
 
     assert(o != NULL);
-    meth_output = _PyObject_CallMethodId(o, meth_id, NULL);
+    meth_output = _PyObject_CallMethodIdNoArgs(o, meth_id);
     if (meth_output == NULL || PyList_CheckExact(meth_output)) {
         return meth_output;
     }

Objects/descrobject.c

@@ -1019,28 +1019,28 @@ static PyObject *
 mappingproxy_keys(mappingproxyobject *pp, PyObject *Py_UNUSED(ignored))
 {
     _Py_IDENTIFIER(keys);
-    return _PyObject_CallMethodId(pp->mapping, &PyId_keys, NULL);
+    return _PyObject_CallMethodIdNoArgs(pp->mapping, &PyId_keys);
 }
 
 static PyObject *
 mappingproxy_values(mappingproxyobject *pp, PyObject *Py_UNUSED(ignored))
 {
     _Py_IDENTIFIER(values);
-    return _PyObject_CallMethodId(pp->mapping, &PyId_values, NULL);
+    return _PyObject_CallMethodIdNoArgs(pp->mapping, &PyId_values);
 }
 
 static PyObject *
 mappingproxy_items(mappingproxyobject *pp, PyObject *Py_UNUSED(ignored))
 {
     _Py_IDENTIFIER(items);
-    return _PyObject_CallMethodId(pp->mapping, &PyId_items, NULL);
+    return _PyObject_CallMethodIdNoArgs(pp->mapping, &PyId_items);
 }
 
 static PyObject *
 mappingproxy_copy(mappingproxyobject *pp, PyObject *Py_UNUSED(ignored))
 {
     _Py_IDENTIFIER(copy);
-    return _PyObject_CallMethodId(pp->mapping, &PyId_copy, NULL);
+    return _PyObject_CallMethodIdNoArgs(pp->mapping, &PyId_copy);
 }
 
 /* WARNING: mappingproxy methods must not give access

Objects/fileobject.c

@@ -61,7 +61,7 @@ PyFile_GetLine(PyObject *f, int n)
     }
 
     if (n <= 0) {
-        result = _PyObject_CallMethodIdObjArgs(f, &PyId_readline, NULL);
+        result = _PyObject_CallMethodIdNoArgs(f, &PyId_readline);
     }
     else {
         result = _PyObject_CallMethodId(f, &PyId_readline, "i", n);

Objects/odictobject.c

@@ -920,7 +920,7 @@ odict_reduce(register PyODictObject *od, PyObject *Py_UNUSED(ignored))
     if (args == NULL)
         goto Done;
 
-    items = _PyObject_CallMethodIdObjArgs((PyObject *)od, &PyId_items, NULL);
+    items = _PyObject_CallMethodIdNoArgs((PyObject *)od, &PyId_items);
     if (items == NULL)
         goto Done;
 
@@ -1421,8 +1421,8 @@ odict_repr(PyODictObject *self)
             Py_SIZE(pieces) = count;
     }
     else {
-        PyObject *items = _PyObject_CallMethodIdObjArgs((PyObject *)self,
-                                                        &PyId_items, NULL);
+        PyObject *items = _PyObject_CallMethodIdNoArgs((PyObject *)self,
+                                                       &PyId_items);
         if (items == NULL)
             goto Done;
         pieces = PySequence_List(items);

Objects/typeobject.c

@@ -4425,7 +4425,7 @@ _PyObject_GetItemsIter(PyObject *obj, PyObject **listitems,
         PyObject *items;
         _Py_IDENTIFIER(items);
 
-        items = _PyObject_CallMethodIdObjArgs(obj, &PyId_items, NULL);
+        items = _PyObject_CallMethodIdNoArgs(obj, &PyId_items);
         if (items == NULL) {
             Py_CLEAR(*listitems);
             return -1;

Objects/weakrefobject.c

@@ -455,7 +455,7 @@ proxy_checkref(PyWeakReference *proxy)
     method(PyObject *proxy, PyObject *Py_UNUSED(ignored)) { \
             _Py_IDENTIFIER(special); \
             UNWRAP(proxy); \
-                return _PyObject_CallMethodId(proxy, &PyId_##special, NULL); \
+                return _PyObject_CallMethodIdNoArgs(proxy, &PyId_##special); \
         }
 
 

Python/bltinmodule.c

@@ -1889,7 +1889,7 @@ builtin_print(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject
         if (do_flush == -1)
             return NULL;
         else if (do_flush) {
-            tmp = _PyObject_CallMethodId(file, &PyId_flush, NULL);
+            tmp = _PyObject_CallMethodIdNoArgs(file, &PyId_flush);
             if (tmp == NULL)
                 return NULL;
             else
@@ -1959,7 +1959,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
     }
 
     /* First of all, flush stderr */
-    tmp = _PyObject_CallMethodId(ferr, &PyId_flush, NULL);
+    tmp = _PyObject_CallMethodIdNoArgs(ferr, &PyId_flush);
     if (tmp == NULL)
         PyErr_Clear();
     else
@@ -1968,7 +1968,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
     /* We should only use (GNU) readline if Python's sys.stdin and
        sys.stdout are the same as C's stdin and stdout, because we
        need to pass it those. */
-    tmp = _PyObject_CallMethodId(fin, &PyId_fileno, NULL);
+    tmp = _PyObject_CallMethodIdNoArgs(fin, &PyId_fileno);
     if (tmp == NULL) {
         PyErr_Clear();
         tty = 0;
@@ -1981,7 +1981,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
         tty = fd == fileno(stdin) && isatty(fd);
     }
     if (tty) {
-        tmp = _PyObject_CallMethodId(fout, &PyId_fileno, NULL);
+        tmp = _PyObject_CallMethodIdNoArgs(fout, &PyId_fileno);
         if (tmp == NULL) {
             PyErr_Clear();
             tty = 0;
@@ -2019,7 +2019,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
         stdin_errors_str = PyUnicode_AsUTF8(stdin_errors);
         if (!stdin_encoding_str || !stdin_errors_str)
             goto _readline_errors;
-        tmp = _PyObject_CallMethodId(fout, &PyId_flush, NULL);
+        tmp = _PyObject_CallMethodIdNoArgs(fout, &PyId_flush);
         if (tmp == NULL)
             PyErr_Clear();
         else
@@ -2114,7 +2114,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
         if (PyFile_WriteObject(prompt, fout, Py_PRINT_RAW) != 0)
             return NULL;
     }
-    tmp = _PyObject_CallMethodId(fout, &PyId_flush, NULL);
+    tmp = _PyObject_CallMethodIdNoArgs(fout, &PyId_flush);
     if (tmp == NULL)
         PyErr_Clear();
     else

Python/errors.c

@@ -1263,7 +1263,7 @@ write_unraisable_exc_file(PyThreadState *tstate, PyObject *exc_type,
     }
 
     /* Explicitly call file.flush() */
-    PyObject *res = _PyObject_CallMethodId(file, &PyId_flush, NULL);
+    PyObject *res = _PyObject_CallMethodIdNoArgs(file, &PyId_flush);
     if (!res) {
         return -1;
     }

Python/import.c

@@ -539,7 +539,7 @@ _PyImport_Cleanup(PyThreadState *tstate)
     }
     else {
         _Py_IDENTIFIER(clear);
-        if (_PyObject_CallMethodId(modules, &PyId_clear, "") == NULL) {
+        if (_PyObject_CallMethodIdNoArgs(modules, &PyId_clear) == NULL) {
             PyErr_WriteUnraisable(NULL);
         }
     }

Python/pylifecycle.c

@@ -1106,7 +1106,7 @@ flush_std_files(void)
     int status = 0;
 
     if (fout != NULL && fout != Py_None && !file_is_closed(fout)) {
-        tmp = _PyObject_CallMethodId(fout, &PyId_flush, NULL);
+        tmp = _PyObject_CallMethodIdNoArgs(fout, &PyId_flush);
         if (tmp == NULL) {
             PyErr_WriteUnraisable(fout);
             status = -1;
@@ -1116,7 +1116,7 @@ flush_std_files(void)
     }
 
     if (ferr != NULL && ferr != Py_None && !file_is_closed(ferr)) {
-        tmp = _PyObject_CallMethodId(ferr, &PyId_flush, NULL);
+        tmp = _PyObject_CallMethodIdNoArgs(ferr, &PyId_flush);
         if (tmp == NULL) {
             PyErr_Clear();
             status = -1;
@@ -1762,7 +1762,7 @@ create_stdio(const PyConfig *config, PyObject* io,
     text = PyUnicode_FromString(name);
     if (text == NULL || _PyObject_SetAttrId(raw, &PyId_name, text) < 0)
         goto error;
-    res = _PyObject_CallMethodId(raw, &PyId_isatty, NULL);
+    res = _PyObject_CallMethodIdNoArgs(raw, &PyId_isatty);
     if (res == NULL)
         goto error;
     isatty = PyObject_IsTrue(res);
@@ -2026,7 +2026,7 @@ _Py_FatalError_PrintExc(int fd)
     Py_XDECREF(tb);
 
     /* sys.stderr may be buffered: call sys.stderr.flush() */
-    res = _PyObject_CallMethodId(ferr, &PyId_flush, NULL);
+    res = _PyObject_CallMethodIdNoArgs(ferr, &PyId_flush);
     if (res == NULL) {
         _PyErr_Clear(tstate);
     }
@@ -2220,7 +2220,7 @@ wait_for_thread_shutdown(PyThreadState *tstate)
         /* else: threading not imported */
         return;
     }
-    result = _PyObject_CallMethodId(threading, &PyId__shutdown, NULL);
+    result = _PyObject_CallMethodIdNoArgs(threading, &PyId__shutdown);
     if (result == NULL) {
         PyErr_WriteUnraisable(threading);
     }

Python/pythonrun.c

@@ -978,7 +978,7 @@ _PyErr_Display(PyObject *file, PyObject *exception, PyObject *value, PyObject *t
     Py_XDECREF(seen);
 
     /* Call file.flush() */
-    PyObject *res = _PyObject_CallMethodId(file, &PyId_flush, NULL);
+    PyObject *res = _PyObject_CallMethodIdNoArgs(file, &PyId_flush);
     if (!res) {
         /* Silently ignore file.flush() error */
         PyErr_Clear();
@@ -1072,7 +1072,7 @@ flush_io(void)
 
     f = _PySys_GetObjectId(&PyId_stderr);
     if (f != NULL) {
-        r = _PyObject_CallMethodId(f, &PyId_flush, NULL);
+        r = _PyObject_CallMethodIdNoArgs(f, &PyId_flush);
         if (r)
             Py_DECREF(r);
         else
@@ -1080,7 +1080,7 @@ flush_io(void)
     }
     f = _PySys_GetObjectId(&PyId_stdout);
     if (f != NULL) {
-        r = _PyObject_CallMethodId(f, &PyId_flush, NULL);
+        r = _PyObject_CallMethodIdNoArgs(f, &PyId_flush);
         if (r)
             Py_DECREF(r);
         else

Python/traceback.c

@@ -430,7 +430,7 @@ _Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
     if (fob == NULL) {
         PyErr_Clear();
 
-        res = _PyObject_CallMethodId(binary, &PyId_close, NULL);
+        res = _PyObject_CallMethodIdNoArgs(binary, &PyId_close);
         Py_DECREF(binary);
         if (res)
             Py_DECREF(res);
@@ -450,7 +450,7 @@ _Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
             break;
         }
     }
-    res = _PyObject_CallMethodId(fob, &PyId_close, NULL);
+    res = _PyObject_CallMethodIdNoArgs(fob, &PyId_close);
     if (res)
         Py_DECREF(res);
     else