[Paraview] python script does not run in macro

[Richardson CFD]

If I have some python script such as the double helix example attached,
it works (runs) in Paraview as programmable filter or programmable source,
but it doesn't run in tools > python shell, or as a macro... why is this?

-- 
Richardson CFD
https://sites.google.com/site/garcfd

<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
Virus-free.
www.avast.com
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
<#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/paraview/attachments/20160511/ffede7ad/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: helix.py
Type: application/octet-stream
Size: 2130 bytes
Desc: not available
URL: <http://public.kitware.com/pipermail/paraview/attachments/20160511/ffede7ad/attachment.obj>