Guido van Rossum <guido <at> python.org> writes: > Hey, I like this! It's a subtle encouragement for developers to > initialize all their instance variables in their __init__ or __new__ > method, with a (modest) performance improvement for a carrot. (Though > I have to admit I have no idea how you do it. Wouldn't the set of dict > keys be different while __init__ is in the middle of setting the > instance variables?) > > Another question: a common pattern is to use (immutable) class > variables as default values for instance variables, and only set the > instance variables once they need to be different. Does such a class > benefit from your improvement? > > > -- HansM >
While I absolutely cannot speak to this implementation. Traditionally this type of approach is refered to as maps, and was pioneered in SELF, originally presented at OOPSLA '89: http://dl.acm.org/citation.cfm?id=74884 . PyPy also uses these maps to back it's object, although from what I've read the implementation looks nothing like the proposed one for CPython, you can read about that here: http://bit.ly/zwlOkV , and if you're really excited about this you can read our implementation here: https://bitbucket.org/pypy/pypy/src/default/pypy/objspace/std/mapdict.py . Alex _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
