Question #261724 on Yade changed:
https://answers.launchpad.net/yade/+question/261724
Status: Needs information => Answered
Jan Stránský proposed the following answer:
>
>
>
> When I ask for properties of the interaction like
> O.interactions[0,1].phys.kmn
>
> it gives ;
> AttributeError: 'NoneType' object has no attribute 'kmn'
>
This means that O.interactions[0,1].phys is None and therefore the
interaction is only potential and not real
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