import prefect
from prefect import Flow, task
from prefect.schedules import Schedule, clocks


@task
def say_hello() -> None:
    logger = prefect.context.get("logger")
    logger.warning("Hello!")


if __name__ == "__main__":
    with Flow("hello-world") as flow:
        say_hello()

    flow.schedule = Schedule(clocks=[clocks.CronClock("* * * * *")])
    flow.register("hello-world")