- Functions are now compared and hashed by identity, not by value, since
the func_code attribute is writable.
+- Weak references (PEP 205) have been added. This involves a few
+ changes in the core, an extension module (_weakref), and a Python
+ module (weakref). The weakref module is the public interface. It
+ includes support for "explicit" weak references, proxy objects, and
+ mappings with weakly held values.
+
Standard library
- mailbox.py now has a new class, PortableUnixMailbox which is