(self)
| 708 | raise IndexError(str(i)) |
| 709 | |
| 710 | def __nonzero__(self): |
| 711 | if hasattr(self, "__len__"): |
| 712 | return self.__len__() != 0 |
| 713 | elif hasattr(self, "_head"): |
| 714 | return True |
| 715 | else: |
| 716 | try: |
| 717 | self._head = next(self.i) |
| 718 | except StopIteration: |
| 719 | return False |
| 720 | else: |
| 721 | return True |
| 722 | |
| 723 | __bool__ = __nonzero__ |
| 724 |