def GetMostRecentClient(client_list, token=None):
  last = rdfvalue.RDFDatetime(0)
  client_urn = None
  for client in aff4.FACTORY.MultiOpen(client_list, token=token):
    client_last = client.Get(client.Schema.LAST)
    if client_last > last:
      last = client_last
      client_urn = client.urn
  return client_urn
If the extension is exportable in Excel, return its column name
dataset/ETHPy150Open google/grr/grr/lib/client_index.py/GetMostRecentClient--crossover with--dataset/ETHPy150Open Net-ng/kansha/kansha/cardextension/comp.py/CardExtension.get_excel_title