gh-117764: Add signatures for __reduce__ and __reduce_ex__ in the _io module (GH-117773)

__reduce__() does not have parameters, __reduce_ex__() has a single
parameter.

Author: serhiy-storchaka

Diff for: Modules/_io/bufferedio.c

@@ -2531,8 +2531,8 @@ static PyMethodDef bufferedreader_methods[] = {
     _IO__BUFFERED_TRUNCATE_METHODDEF
     _IO__BUFFERED___SIZEOF___METHODDEF
 
-    {"__reduce__", _PyIOBase_cannot_pickle, METH_VARARGS},
-    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_VARARGS},
+    {"__reduce__", _PyIOBase_cannot_pickle, METH_NOARGS},
+    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_O},
     {NULL, NULL}
 };
 
@@ -2591,8 +2591,8 @@ static PyMethodDef bufferedwriter_methods[] = {
     _IO__BUFFERED_TELL_METHODDEF
     _IO__BUFFERED___SIZEOF___METHODDEF
 
-    {"__reduce__", _PyIOBase_cannot_pickle, METH_VARARGS},
-    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_VARARGS},
+    {"__reduce__", _PyIOBase_cannot_pickle, METH_NOARGS},
+    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_O},
     {NULL, NULL}
 };
 
@@ -2709,8 +2709,8 @@ static PyMethodDef bufferedrandom_methods[] = {
     _IO_BUFFEREDWRITER_WRITE_METHODDEF
     _IO__BUFFERED___SIZEOF___METHODDEF
 
-    {"__reduce__", _PyIOBase_cannot_pickle, METH_VARARGS},
-    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_VARARGS},
+    {"__reduce__", _PyIOBase_cannot_pickle, METH_NOARGS},
+    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_O},
     {NULL, NULL}
 };
 

Diff for: Modules/_io/fileio.c

@@ -1178,8 +1178,8 @@ static PyMethodDef fileio_methods[] = {
     _IO_FILEIO_FILENO_METHODDEF
     _IO_FILEIO_ISATTY_METHODDEF
     {"_dealloc_warn", (PyCFunction)fileio_dealloc_warn, METH_O, NULL},
-    {"__reduce__", _PyIOBase_cannot_pickle, METH_VARARGS},
-    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_VARARGS},
+    {"__reduce__", _PyIOBase_cannot_pickle, METH_NOARGS},
+    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_O},
     {NULL,           NULL}             /* sentinel */
 };
 

Diff for: Modules/_io/textio.c

@@ -3337,8 +3337,8 @@ static PyMethodDef textiowrapper_methods[] = {
     _IO_TEXTIOWRAPPER_TELL_METHODDEF
     _IO_TEXTIOWRAPPER_TRUNCATE_METHODDEF
 
-    {"__reduce__", _PyIOBase_cannot_pickle, METH_VARARGS},
-    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_VARARGS},
+    {"__reduce__", _PyIOBase_cannot_pickle, METH_NOARGS},
+    {"__reduce_ex__", _PyIOBase_cannot_pickle, METH_O},
     {NULL, NULL}
 };