= slice_length: sliced.popleft(); count = count + 1 sliced.append(frame_item) return iter(sliced) # -1 for frame_high means until the end of the backtrace. Set to # None if that is the case, to indicate to itertools.islice to # slice to the end of the iterator. if frame_high == -1: frame_high = None else: # As frames start from 0, add one to frame_high so islice # correctly finds the end frame_high = frame_high + 1; sliced = itertools.islice(frame_iterator, frame_low, frame_high) return sliced