Python

Includes a range of improvements of the 3.x series, as well as easier porting between 2.x and 3.x. Major new features have been added to the 3.3 release series.

Several reported security issues were fixed, including a hash collision denial of service, Expat hash collision denial of service, SimpleXMLRPCServer denial of service, and disabling of the CBC IV attack countermeasure in the _ssl module.

This release mainly fixes a regression with the urllib.request module that prevented opening many HTTP resources correctly.

Many bugfixes and enhancements were made. Many consistency and behavior fixes were made for numeric operations.

Numerous improvements to the unittest module. PEP 3147, support for .pyc repository directories. PEP 3149, support for version tagged dynamic libraries. PEP 3148, a new futures library for concurrent programming. PEP 384, a stable ABI for extension modules. PEP 391, dictionary-based logging configuration. An overhauled GIL implementation that reduces contention. An extended email package that handles bytes messages. A much improved SSL module with support for SSL contexts and certificate hostname matching. A sysconfig module to access configuration information.