On 2016-06-13 17:34, Ethan Furman wrote:
On 06/10/2016 02:13 PM, Franklin? Lee wrote:
P.S.: If anyone is missing the relevance, Raymond Hettinger's compact
dicts are inherently ordered until a delitem happens.[1] That could be
"good enough" for many purposes, including kwargs and class definition.
It would be great for kwargs, but not for class definition: del's can
happen there, so we need PEP 520 with OrderedDict so the definition
order is not lost when an item is deleted during class creation.
The order can be lost when an item is deleted because it moves the last
item into the 'hole' left by the deleted item.
This could be avoided by expanding the items to include the index of the
'previous' and 'next' item, so that they could be handled like a
doubly-linked list.
The disadvantage would be that it would use more memory.
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