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[Jan Stránský <question254558@xxxxxxxxxxxxxxxxxxxxx>]

Question #254558 on Yade changed:
https://answers.launchpad.net/yade/+question/254558

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Christopher,

"key" should be a function to be used for the sort. One possibility is to
use lambda structure [1]

key=lambda b: b.state.pos[0]

cheers
Jan

[1] https://wiki.python.org/moin/HowTo/Sorting
Dne 15.9.2014 21:08 "Christopher Stanbridge" <
question254558@xxxxxxxxxxxxxxxxxxxxx> napsal(a):

> New question #254558 on Yade:
> https://answers.launchpad.net/yade/+question/254558
>
> At one point in my code, I need to sort a list of bodies from least to
> greatest x-coordinate. I have attempted to use the sorted() method but am
> not quite sure what I would use as my "key". I know State.pos[0] store the
> x-coordinate, but when I try to use
> key=State.pos[0]
> (or, it seems, any variant thereof) I get the following error.
> TypeError: 'property' object has no attribute '__getitem__'
>
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