0. bodies invalid syntax

Asked by Cao

Hello everyone!
    I am learning the basic code of Yade. I was trying to put python code.

In [1] len(0.bodies)

Unfortunately, i got an error which is invalid syntax , i want to know how tho fix this.

Thanks a lot

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Cao
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Cao (guangle) said :
#1

I SEE, this is Capitial O ,not 0