| 525 | import time |
| 526 | |
| 527 | class Zero(DataFlow): |
| 528 | def __init__(self, size): |
| 529 | self._size = size |
| 530 | |
| 531 | def __iter__(self): |
| 532 | for k in range(self._size): |
| 533 | yield [k] |
| 534 | |
| 535 | def __len__(self): |
| 536 | return self._size |
| 537 | |
| 538 | def f(x): |
| 539 | if x[0] < 10: |