How to write "Arc.ByFillet" node in Python?

DesignScript
1

Any suggestion will be apreciated

import clr
clr.AddReference(‘ProtoGeometry’)
from Autodesk.DesignScript.Geometry import *

clr.AddReference(“RevitAPIUI”)
from Autodesk.Revit.UI import TaskDialog

clr.AddReference(“RevitAPI”)
import Autodesk
from Autodesk.Revit.DB.Events import *
from Autodesk.Revit.DB import *

clr.AddReference(“RevitNodes”)
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)

plist = IN[0]
listnum = IN[1]
for i in range (0 , IN[1]):
listmain = plist[i]
curve11 = listmain[0]
curve22 = listmain[1]
curev1 = UnwrapElement (curve11)
curev2 = UnwrapElement (curve22)

Autodesk.DesignScript.Geometry.Arc.ByFillet(Autodesk.DesignScript.Geometry.Curve   (curve1),Autodesk.DesignScript.Geometry.Curve (curve2),System.Double (0.0))

OUT = curve11