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# Active Span replacement example.
This example shows a `Span` being created and then passed to an asynchronous task, which will temporary activate it to finish its processing, and further restore the previously active `Span`.
`threading` implementation:
```python
# Create a new Span for this task
with self.tracer.start_active_span('task'):
with self.tracer.scope_manager.activate(span, True):
# Simulate work strictly related to the initial Span
pass
# Use the task span as parent of a new subtask
with self.tracer.start_active_span('subtask'):
pass
```
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