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[Python-Dev] A new dictionary implementation
Michael Foordfuzzyman at voidspace.org.uk
Thu Feb 2 18:03:32 CET 2012
On 02/02/2012 11:30, Chris Withers wrote:> On 01/02/2012 17:50, Guido van Rossum wrote:>> 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?>> A less common pattern, but which still needs to work, is where a> mutable class variable is deliberately store state across all> instances of a class...>Given that Mark's patch passes the Python test suite I'm sure basic patterns like this *work*, the question is which of them take advantage of the improved memory efficiency. In the case you mention I don't think it's an issue at all, because the class level attribute doesn't (generally) appear in instance dicts.What's also common is where the class holds a *default* value for instances, which may be overridden by an instance attribute on *some* instances.All the best,Michael Foord> Chris>--http://www.voidspace.org.uk/May you do good and not evilMay you find forgiveness for yourself and forgive othersMay you share freely, never taking more than you give.-- the sqlite blessinghttp://www.sqlite.org/different.html
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