Why RevitServices module doesn't work in Sandbox?

Developers
,
1

Who can tell me why the code below runs without errors in Dynamo Revit, but in Dynamo Sandbox it gives an error ‘Cannot import name DocumentManager’?

# Enable Python support and load DesignScript library
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

clr.AddReferenceToFileAndPath(r"C:\Program Files\Dynamo\Dynamo Revit\2\Revit_2019\RevitNodes.dll")

clr.AddReferenceToFileAndPath(r"C:\Program Files\Dynamo\Dynamo Revit\2\Revit_2019\RevitServices.dll")

import RevitServices
from RevitServices.Persistence import DocumentManager

Or similarly: why code below does run in Dynamo for Revit, but in Sandbox gives error
‘attribute DocumentManager of namespace# object is readonly’

# Enable Python support and load DesignScript library
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

clr.AddReferenceToFileAndPath(r"C:\Program Files\Dynamo\Dynamo Revit\2\Revit_2019\RevitNodes.dll")

clr.AddReferenceToFileAndPath(r"C:\Program Files\Dynamo\Dynamo Revit\2\Revit_2019\RevitServices.dll")

import RevitServices

uiapp = RevitServices.Persistence # runs fine
uiapp = RevitServices.Persistence.DocumentManager # gives error
2

The Revit API can only be called from inside Revit, so Dynamo For Revit is required to access it.