[issue7170] subclasses of (some) built-in types are not weakref-able

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

The documentation should be rewritten for clarity then. The reason you
can't take weakrefs of those types is because they are implemented as
"varsized" objects, so there is no constant place to add a weakref list
in the memory layout of the objects.

----------
assignee:  -> georg.brandl
components: +Documentation -Interpreter Core
nosy: +georg.brandl

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7170>
_______________________________________