>>91
Design Goals あたりがポイントぽいのでまとめてみた

Decorator の実装に関する議論をまとめた wiki
http://wiki.python.org/moin/PythonDecorators
Phillip Eby さんの解説記事
http://www.everes.net/2007/aug/12/python-decorator/
Jim Hugunin さんのレシピ集
http://mail.python.org/pipermail/python-dev/2004-April/044132.html

a gazillion(何億兆) "toy parser" tools out there (from Emacs python-mode to Python's own pyclbr.py) would have to be changed too
http://groups.google.com/group/comp.lang.python/msg/949f9d7f1eb2644c?hl=en&lr=&ie=UTF-8&oe=UTF-8