import clr
clr.AddReference('ProtoGeometry')
clr.AddReference("RevitServices")
clr.AddReference("RevitAPI")
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.GeometryConversion)
from Autodesk.DesignScript.Geometry import *
from Autodesk.Revit.DB import *
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
pt1 = XYZ(0,0,0);
pt2 = XYZ(20,0,0)
doc = DocumentManager.Instance.CurrentDBDocument
view = doc.ActiveView
# "Start" the transaction
TransactionManager.Instance.EnsureInTransaction(doc)
line = Line.CreateBound(pt1, pt2)
cline = doc.Create.NewDetailCurve(view,line)
# "End" the transaction
TransactionManager.Instance.TransactionTaskDone()
OUT = cline