code: def __getitem__(self, item):
      if self._cache_complete:
          return self._cache[item]
      elif isinstance(item, slice):
          if item.step and item.step < 0:
              return list(iter(self))[item]
          else:
              return list(
                  itertools.islice(
                      self,
                      item.start or 0,
                      item.stop or sys.maxsize,
                      item.step or 1,
                  )
              )
      elif item >= 0:
          gen = iter(self)
          try:
              for i in range(item + 1):
                  res = advance_iterator(gen)
          except StopIteration:
              raise IndexError
          return res
      else:
          return list(iter(self))[item]
  
imports: import calendar
  import datetime
  import heapq
  import itertools
  import re
  import sys
  from functools import wraps
  from warnings import warn
  from six import advance_iterator, integer_types
  from six.moves import _thread, range
  from ._common import weekday
label_desc: Use image node_id 5 for calling the rrulebase obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self, list, list, res, list