Hi there I am trying to implement a recursive flow pattern i

Question

Hi there I am trying to implement a recursive flow pattern in prefect 2 0 any tips on how to do this I ve seen some methods that leverage async in the code contest submissions but am curious if it is possible to implement it without async I ve included my attempts in the comments

Rio McMahon · Answer

```from prefect import flow task task def print input i print i flow def print recursively i print input i i += 1 if i lt = 10 print recursively i return i if name == main print recursively 1 ```

Rio McMahon · Answer

However when I try this I get a `RuntimeError The task runner is already started ` error

Rio McMahon · Answer

Second related question if I want to schedule a flow from python is that possible I think an alternative to running flows recursively in the manner described about would be to have the flow push itself to a task queue Is this possible to do If not is it possible to access the scheduler from python code rather than the UI Thanks

Nico Neumann · Answer

First question It seems flows cannot be recursively called but tasks can As you cannot call tasks within task directly I added ` fn` This works for me ```from prefect import flow task task def print input i print i task def print recursively i print input fn i i += 1 if i lt = 10 print recursively fn i return i flow def run flow i print recursively i if name == main run flow 1 ```

Nico Neumann · Answer

Second question You can use the `client` needs async to interact with your flows deployments ```import asyncio from prefect import flow from prefect client import get client flow async def run flow async with get client as client print your deployment id here or using prefect deployment ls deployments = await client read deployments deployment id = put your deployment id here for i in range 10 parameters = i i flow run = await client create flow run from deployment deployment id=deployment id parameters=parameters if name == main asyncio run run flow ```

Rio McMahon · Answer

< Nico Neumann> Thanks for the feedback help I think that these will work nicely