[EMAIL PROTECTED] wrote:
> Working with several thousand tagged items on a Tkinter Canvas, I want
> to change different configurations of objects having a certain group of
> tags.
>
> I've used the sets module, on the tuple returned by Tkinter.Canvas.
> find_withtag() method.
>
> Since this method takes only one tag at time, I use it for each tag
> that is part of the look-up group, create a set object for each tuple
> and intersect the resulting sets, that I tuple out again to feed a loop
> to change the configuration of the items.
>
> Anyone have a more pythonic way (or better performing ) way to suggest
> ?
It depends. If the search on tags is implemented linear, it might be
better to loop over all items and filter suing a compound predicate,
like this:
rouge_artefacts = [item for m1.all_itmes() if item.has_tag("rouge") and
item.has_tag("artefact")]
Please note that I don't know TKinter's API, but I can't imagine that it
lacks the possibility to fettch a list of all items and query an item
for it tags. The synopsis may vary from above, thogh.
But if tkinter stores the tagged items as mapping of tag -> set/list,
then I think your approach is as fast as you can get. Time it out. And
maybe another thing would be to manage that tagging relation yourself.
Regards,
Diez
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