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[Ray Mong <question228866@xxxxxxxxxxxxxxxxxxxxx>]

New question #228866 on Yade:
https://answers.launchpad.net/yade/+question/228866

In the introduction part, it introduces two yade command firstly, which are
TriaxialTest(numberOfGrains=200).load()
len(O.bodies)

what is the meaning of len()?
I can not find this command by search.

This question is very amateur, but I realy want to know.

Thank you very much.

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