Try this:
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
# Import DocumentManager and TransactionManager
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
uiapp = DocumentManager.Instance.CurrentUIApplication
app = uiapp.Application
# Import RevitAPI
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *
#The inputs to this node will be stored as a list in the IN variables.
dataEnteringNode = IN
filePath = IN[0]
view = UnwrapElement(IN[1])
options = DWGImportOptions()
options.AutoCorrectAlmostVHLines = True
options.ColorMode = ImportColorMode.BlackAndWhite
options.OrientToView = True
options.ThisViewOnly = True
options.VisibleLayersOnly = True
linkedElem = clr.Reference[ElementId]()
TransactionManager.Instance.EnsureInTransaction(doc)
doc.Link(filePath, options, view, linkedElem)
TransactionManager.Instance.TransactionTaskDone()
#Assign your output to the OUT variable.
OUT = 0
