Is there any example code available for calling flows via some python API (flask / fastapi).

Are you using Prefect 1 or 2? You can hit the API for both to trigger flow runs

I am using Prefect 1

You are trying to use

flow.run()

with an API? I think it will be easier if you trigger a Prefect Cloud Flow Run

I am trying to test locally. That's why using that. If I run the flow code as it is, it is working fine. But when ran with flask it is throwing this error. How to trigger prefect cloud flow run?

You can use the

Client.create_flow_run

Okay will try that. Let me know if there is any work around with running locally

I see - but there is no need to do that - you can use the create_flow_run_task directly in your flow without client and without agent config:

from prefect import Flow
from prefect.tasks.prefect import create_flow_run, wait_for_flow_run

PROJECT_NAME = "community"


with Flow("sample_flow") as flow:
    child_run_id = create_flow_run(
        flow_name="child_flow",
        project_name=PROJECT_NAME,
        task_args={"name": "Friendly name for a DAG node"},
    )
    extract_load_wait_task = wait_for_flow_run(
        child_run_id,
        raise_final_state=True,
        stream_logs=True,
        task_args={"name": "Friendly wait task name"},
    )