Unroll group with only one member. This allows treating a group of a single task as if it was a single task without pre-knowledge.
(group)
| 40 | |
| 41 | |
| 42 | def maybe_unroll_group(group): |
| 43 | """Unroll group with only one member. |
| 44 | This allows treating a group of a single task as if it |
| 45 | was a single task without pre-knowledge.""" |
| 46 | # Issue #1656 |
| 47 | try: |
| 48 | size = len(group.tasks) |
| 49 | except TypeError: |
| 50 | try: |
| 51 | size = group.tasks.__length_hint__() |
| 52 | except (AttributeError, TypeError): |
| 53 | return group |
| 54 | else: |
| 55 | return list(group.tasks)[0] if size == 1 else group |
| 56 | else: |
| 57 | return group.tasks[0] if size == 1 else group |
| 58 | |
| 59 | |
| 60 | def task_name_from(task): |