3 files changed, 13 insertions, 15 deletions
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index ae4af9d..f751446 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -2398,7 +2398,6 @@ static PyMethodDef bufferedreader_methods[] = {
     {"close", (PyCFunction)buffered_close, METH_NOARGS},
     {"seekable", (PyCFunction)buffered_seekable, METH_NOARGS},
     {"readable", (PyCFunction)buffered_readable, METH_NOARGS},
-    {"writable", (PyCFunction)buffered_writable, METH_NOARGS},
     {"fileno", (PyCFunction)buffered_fileno, METH_NOARGS},
     {"isatty", (PyCFunction)buffered_isatty, METH_NOARGS},
     {"_dealloc_warn", (PyCFunction)buffered_dealloc_warn, METH_O},
@@ -2489,7 +2488,6 @@ static PyMethodDef bufferedwriter_methods[] = {
     {"close", (PyCFunction)buffered_close, METH_NOARGS},
     {"detach", (PyCFunction)buffered_detach, METH_NOARGS},
     {"seekable", (PyCFunction)buffered_seekable, METH_NOARGS},
-    {"readable", (PyCFunction)buffered_readable, METH_NOARGS},
     {"writable", (PyCFunction)buffered_writable, METH_NOARGS},
     {"fileno", (PyCFunction)buffered_fileno, METH_NOARGS},
     {"isatty", (PyCFunction)buffered_isatty, METH_NOARGS},
diff --git a/Modules/_io/clinic/iobase.c.h b/Modules/_io/clinic/iobase.c.h
index 3cea079..9762f11 100644
--- a/Modules/_io/clinic/iobase.c.h
+++ b/Modules/_io/clinic/iobase.c.h
@@ -66,7 +66,7 @@ PyDoc_STRVAR(_io__IOBase_seekable__doc__,
 "\n"
 "Return whether object supports random access.\n"
 "\n"
-"If False, seek(), tell() and truncate() will raise UnsupportedOperation.\n"
+"If False, seek(), tell() and truncate() will raise OSError.\n"
 "This method may need to do a test seek().");
 
 #define _IO__IOBASE_SEEKABLE_METHODDEF    \
@@ -87,7 +87,7 @@ PyDoc_STRVAR(_io__IOBase_readable__doc__,
 "\n"
 "Return whether object was opened for reading.\n"
 "\n"
-"If False, read() will raise UnsupportedOperation.");
+"If False, read() will raise OSError.");
 
 #define _IO__IOBASE_READABLE_METHODDEF    \
     {"readable", (PyCFunction)_io__IOBase_readable, METH_NOARGS, _io__IOBase_readable__doc__},
@@ -107,7 +107,7 @@ PyDoc_STRVAR(_io__IOBase_writable__doc__,
 "\n"
 "Return whether object was opened for writing.\n"
 "\n"
-"If False, write() will raise UnsupportedOperation.");
+"If False, write() will raise OSError.");
 
 #define _IO__IOBASE_WRITABLE_METHODDEF    \
     {"writable", (PyCFunction)_io__IOBase_writable, METH_NOARGS, _io__IOBase_writable__doc__},
@@ -127,7 +127,7 @@ PyDoc_STRVAR(_io__IOBase_fileno__doc__,
 "\n"
 "Returns underlying file descriptor if one exists.\n"
 "\n"
-"An IOError is raised if the IO object does not use a file descriptor.");
+"OSError is raised if the IO object does not use a file descriptor.");
 
 #define _IO__IOBASE_FILENO_METHODDEF    \
     {"fileno", (PyCFunction)_io__IOBase_fileno, METH_NOARGS, _io__IOBase_fileno__doc__},
@@ -276,4 +276,4 @@ _io__RawIOBase_readall(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
     return _io__RawIOBase_readall_impl(self);
 }
-/*[clinic end generated code: output=fe034152b6884e65 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=b874952f5cc248a4 input=a9049054013a1b77]*/
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 025007e..090891d 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -335,13 +335,13 @@ _io._IOBase.seekable
 
 Return whether object supports random access.
 
-If False, seek(), tell() and truncate() will raise UnsupportedOperation.
+If False, seek(), tell() and truncate() will raise OSError.
 This method may need to do a test seek().
 [clinic start generated code]*/
 
 static PyObject *
 _io__IOBase_seekable_impl(PyObject *self)
-/*[clinic end generated code: output=4c24c67f5f32a43d input=22676eebb81dcf1e]*/
+/*[clinic end generated code: output=4c24c67f5f32a43d input=b976622f7fdf3063]*/
 {
     Py_RETURN_FALSE;
 }
@@ -368,12 +368,12 @@ _io._IOBase.readable
 
 Return whether object was opened for reading.
 
-If False, read() will raise UnsupportedOperation.
+If False, read() will raise OSError.
 [clinic start generated code]*/
 
 static PyObject *
 _io__IOBase_readable_impl(PyObject *self)
-/*[clinic end generated code: output=e48089250686388b input=12fc3d8f6be46434]*/
+/*[clinic end generated code: output=e48089250686388b input=285b3b866a0ec35f]*/
 {
     Py_RETURN_FALSE;
 }
@@ -401,12 +401,12 @@ _io._IOBase.writable
 
 Return whether object was opened for writing.
 
-If False, write() will raise UnsupportedOperation.
+If False, write() will raise OSError.
 [clinic start generated code]*/
 
 static PyObject *
 _io__IOBase_writable_impl(PyObject *self)
-/*[clinic end generated code: output=406001d0985be14f input=c17a0bb6a8dfc590]*/
+/*[clinic end generated code: output=406001d0985be14f input=9dcac18a013a05b5]*/
 {
     Py_RETURN_FALSE;
 }
@@ -456,12 +456,12 @@ _io._IOBase.fileno
 
 Returns underlying file descriptor if one exists.
 
-An IOError is raised if the IO object does not use a file descriptor.
+OSError is raised if the IO object does not use a file descriptor.
 [clinic start generated code]*/
 
 static PyObject *
 _io__IOBase_fileno_impl(PyObject *self)
-/*[clinic end generated code: output=7cc0973f0f5f3b73 input=32773c5df4b7eede]*/
+/*[clinic end generated code: output=7cc0973f0f5f3b73 input=4e37028947dc1cc8]*/
 {
     return iobase_unsupported("fileno");
 }