revitLinkTypeSetAttachmentType.py

import clr
clr.AddReference("RevitAPI")

from Autodesk.Revit.DB import *

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

doc = DocumentManager.Instance.CurrentDBDocument

linkTypes = UnwrapElement(IN[0])

attachmentType = IN[1]

results = []

TransactionManager.Instance.EnsureInTransaction(doc)
for link in linkTypes:
	if attachmentType == 0:
		link.AttachmentType = AttachmentType.Attachment
		results.append("Changed to attached")
	if attachmentType == 1:
		link.AttachmentType = AttachmentType.Overlay
		results.append("Changed to overlay")
TransactionManager.Instance.TransactionTaskDone()		

OUT = linkTypes, results