DeleteElements.py

import clr

clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Structure import *

clr.AddReference('RevitAPIUI')
from Autodesk.Revit.UI import *

clr.AddReference('System')
from System.Collections.Generic import List

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

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

#Preparing input from dynamo to revit
elements = UnwrapElement(IN[0])

# list to append to
list = []

TransactionManager.Instance.EnsureInTransaction(doc)
#iterate through elements
for i in elements:
	name = i.Category.Name
	try: #try to delete, if successful append success to name
		doc.Delete(i.Id)
		list.append(name + "- success")
	except:#if failed append fail to name
		list.append(name + "- fail")
TransactionManager.Instance.TransactionTaskDone()
# output the list
OUT = list