[Paraview] question about programmable filter

[Сергей Михайлов]

Hello !
We have the following  3D object:  

I want to  left cylinder in the center of the object and delete another part of the object. The result of such operation is cylinder.
Help me please write  a programmable filter (in Python)  to perform this modification in the object.
 
 
Best regards, Sergey
 
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