Merged revisions 75580 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r75580 | georg.brandl | 2009-10-21 09:15:59 +0200 (Mi, 21 Okt 2009) | 1 line
#7170: fix explanation about non-weakrefable builtin types.
........
diff --git a/Doc/library/weakref.rst b/Doc/library/weakref.rst
index dcc5bf3..06a432d 100644
--- a/Doc/library/weakref.rst
+++ b/Doc/library/weakref.rst
@@ -72,6 +72,10 @@
obj = Dict(red=1, green=2, blue=3) # this object is weak referenceable
+Other built-in types such as :class:`tuple` and :class:`int` 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`.