Python to select curtain walls in group

Developers
2

I see that this is an old post but I came across it whilst looking to do a similar thing. The code below got me what I needed, maybe it will still be relevant for you:

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

groups = UnwrapElement(IN[0])
elementlist, curtainWalls = [], []

for item in groups:
	memberlist = []
	for member in UnwrapElement(item.GetMemberIds()):
		#convert ElementId to Element
		memberEl = item.Document.GetElement(member)
		try:
			#filter by elements' Curtain Grid properties
			if memberEl.CurtainGrid.NumULines:
				memberlist.append(memberEl)
		except:
			elementlist.append(memberEl)
	curtainWalls.append(memberlist)

OUT = curtainWalls, elementlist

Admittedly this is a combination of your code above and the linked forum post https://forum.dynamobim.com/t/how-to-get-curtain-wall-grid-horizontal-and-vertical-grid-count/38374/2?u=eoin_prunty