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[Python-Dev] PEP for new dictionary implementation
Mark Shannonmark at hotpy.org
Sat Feb 11 22:22:01 CET 2012
Antoine Pitrou wrote:> Hello Mark,>> I think the PEP should explain what happens when a keys table needs> resizing when setting an object's attribute.If the object is the only instance of a class, it remains split,otherwise the table is combined.Most OO code will set attributes in the __init__ method so all attributes are set before a second instance is created.For more complex use patterns, it is impossible to know what is thebest approach, so the implementation allows extra insertions up to the point of a resize when it reverts to the combined table (non-shared keys).(This may not be the case in the bitbucket repository,I'll push the newer version tomorrow).> Reading the implementation, it seems the sharing can disappear> definitely, which seems a bit worrying.It is immediately re-split (to allow sharing) when only one instance of the class exists.I've implemented it that way (resize->combined then re-split) as most resizes (999 out of 1000) will be of combined tables, and I don't want to complicate the fast path.Cheers,Mark.
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