Hey,
Try this?
#thanks to paul wintour
import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
doc = DocumentManager.Instance.CurrentDBDocument
stair = UnwrapElement(IN[0])
runs = []
landings = []
runids = stair.GetStairsRuns()
landingids = stair.GetStairsLandings()
for run in runids:
runs.append(doc.GetElement(run))
for landing in landingids:
landings.append(doc.GetElement(landing))
OUT = runs, landings
Hope that helps,
Mark