#7170: fix explanation about non-weakrefable builtin types.

2009-10-21 07:15:59 +00:00 · 2009-10-21 07:15:59 +00:00 · cf842ad418
parent 9bd246bba9
commit cf842ad418
1 changed files with 4 additions and 0 deletions
--- a/Doc/library/weakref.rst
+++ b/Doc/library/weakref.rst
@ -76,6 +76,10 @@ support weak references but can add support through subclassing::

   obj = Dict(red=1, green=2, blue=3)   # this object is weak referenceable

+Other built-in types such as :class:`tuple` and :class:`long` do not support
+weak references even when subclassed (those types implemented as a
+:ctype:`PyVarObject`).
+
 Extension types can easily be made to support weak references; see
 :ref:`weakref-support`.