Iterate and generate a tuple with a flag for first value.
(values: Iterable[T])
| 4 | |
| 5 | |
| 6 | def loop_first(values: Iterable[T]) -> Iterable[Tuple[bool, T]]: |
| 7 | """Iterate and generate a tuple with a flag for first value.""" |
| 8 | iter_values = iter(values) |
| 9 | try: |
| 10 | value = next(iter_values) |
| 11 | except StopIteration: |
| 12 | return |
| 13 | yield True, value |
| 14 | for value in iter_values: |
| 15 | yield False, value |
| 16 | |
| 17 | |
| 18 | def loop_last(values: Iterable[T]) -> Iterable[Tuple[bool, T]]: |
no outgoing calls