Appendix G. PEP 3003: Python Language Moratorium
Authors: Brett Cannon, Jesse Noller, Guido van Rossum
This PEP proposes a temporary moratorium (suspension) of all changes to the Python language syntax, semantics, and built-ins for a period of at least two years from the release of Python 3.1. In particular, the moratorium would include Python 3.2 (to be released 18–24 months after 3.1) but allow Python 3.3 (assuming it is not released prematurely) to once again include language changes.
This suspension of features is designed to allow non-CPython implementations to "catch up" to the core implementation of the language, help ease adoption of Python 3.x, and provide a more stable base for the community.
This idea was proposed by Guido ...