#### import the simple module from the paraview
from paraview.simple import *
#### disable automatic camera reset on 'Show'
#paraview.simple._DisableFirstRenderCameraReset()

# get active source.
mysource = GetActiveSource()

# get active view
renderView1 = GetActiveViewOrCreate('RenderView')

# get display properties
mysourceDisplay = GetDisplayProperties(mysource, view=renderView1)

# Properties to modify
mysourceDisplay.Opacity = 1

# update view for immediate effect
RenderAllViews()