commit 5c4064e8bd199d70eefd7ec24766957c22f1b8e8
author Serhiy Storchaka <storchaka@gmail.com> Sat Dec 19 20:05:25 2015 +0200
committer Serhiy Storchaka <storchaka@gmail.com> Sat Dec 19 20:05:25 2015 +0200
tree a38d9933d5ee0d72fbebba31f046686e678a2c3c
parent efd7b34d7c4e401bbecb343da7c9506137a3b2fe

Issue #25421: __sizeof__ methods of builtin types now use dynamic basic size.
This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.

Modules/_io/bufferedio.c

diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 29e000b..6bb2200 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -423,7 +423,7 @@
 {
     Py_ssize_t res;
 
-    res = sizeof(buffered);
+    res = _PyObject_SIZE(Py_TYPE(self));
     if (self->buffer)
         res += self->buffer_size;
     return PyLong_FromSsize_t(res);