How to use PickElementsByRectangle method to select the filter. my code as shown below. but i got some error

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import clr
clr.AddReference(‘RevitAPI’)
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Mechanical import *

clr.AddReference(‘RevitAPIUI’)
from Autodesk.Revit.UI import *
from Autodesk.Revit.UI.Selection import *
clr.AddReference(‘System’)
from System.Collections.Generic import List

clr.AddReference(‘RevitNodes’)
import Revit
clr.ImportExtensions(Revit.GeometryConversion)
clr.ImportExtensions(Revit.Elements)

clr.AddReference(‘RevitServices’)
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument
uidoc=DocumentManager.Instance.CurrentUIApplication.ActiveUIDocument

sel = uidoc.Selection.GetElementIds()
#dis = uidoc.Selection.PickElementsByRectangle()
#dis = uidoc.Selection.PickElementsByRectangle("Select")
dis = uidoc.Selection.PickElementsByRectangle(AllowElement(sel))
#elemlist =
#for l in dis:

elemid = l.id

elemlist.append(elemid)

#for l in sel:

elem = (doc.GetElement(l))

elemlist.append(elem)

OUT = dis