Question #290070 on Yade changed:
https://answers.launchpad.net/yade/+question/290070
Status: Open => Answered
Bruno Chareyre proposed the following answer:
This:
global xy
xy=[]
is just not doing what you expect. There is no 'xy' in globals after that:
KeyError: 'xy'
Did you try the second method?
Bruno
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