How to set bodies transparent in Mechanical?

From 2021R1 onwards:

transparency = body.PropertyByName("Transparency")
# Change the value from 0-1, 1 being opaque, 0 being completely transparent.
transparency.InternalValue = 0.5

For previous versions (from Landon Kanner's TIG post):

DS = ExtAPI.DataModel.InternalObject["ds"] 
bodies = ExtAPI.DataModel.Project.Model.Geometry.GetChildren[Ansys.ACT.Automation.Mechanical.Body](True)
DS.Graphics.Drawable(bodies[0].InternalObject).Material.Transparency = 0.5