(self)
| 48 | return iter(self.data) |
| 49 | |
| 50 | def __len__(self): |
| 51 | if self.data is None: |
| 52 | _fill_lock.acquire() |
| 53 | try: |
| 54 | if self.data is None: |
| 55 | self._fill() |
| 56 | finally: |
| 57 | _fill_lock.release() |
| 58 | return len(self.data) |
| 59 | |
| 60 | def keys(self): |
| 61 | if self.data is None: |