code: def last_close(self):
      return self._last_close
  
imports: import logbook
  import pandas
  from zipline.utils.memoize import remember_last
  from zipline.utils.pandas_utils import normalize_date
label_desc: Use image node_id 11 for calling the SimulationParameters obj's underlying member method code with example usage: obj.last_close() and returns: self