Forcing a Flow to a Finished State

The use case here is to render something other than a Success/Failed state.

The UI supports Flows in a Finished state, though you need to return it using a state handler. For example:

from prefect import Flow, task
from prefect.engine.state import Finished

def handler(obj, old_state, new_state):
    if isinstance(new_state, Finished):
        return Finished("finished")
        return new_state

def mytask():
    return 1

with Flow(name="POC2", state_handlers=[handler]) as flow:

which will render as Blue in the UI

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