[Paraview] Deleting Items in Python

[Robert Maynard]

What is the syntax to delete an object that has been created in python, and
than been registered with ParaView?

For example I create a sphere like this:
  view = servermanager.GetRenderView()
  sphere = servermanager.sources.SphereSource(registrationGroup='sources',
registrationName='del')
  dataDisplay = servermanager.CreateRepresentation(sphere, view,
registrationGroup='representations')

Than trying to delete it by using the del command (del sphere, etc) does not
work.
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