Python Language Moratorium

Authors of this PEP: Brett Cannon, Jesse Noller, Guido van Rossum

This appendix provides interesting insight to the underling methodology and processes in Python development. Considering that there are two distinct strands of Python, 2.x and 3.x, this insight may shed some light on development of the language(s) behind the scenes.


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 ...

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