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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