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# marvin-in-the-wild

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01/25/2024, 7:43 PM

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Marvin

01/25/2024, 7:43 PM

There weren't any clear and specific examples related to flow scheduling with dynamic arguments or parameters in the documents provided. However, based on the information, I can give you a general idea of how you might implement a flow schedule with dynamic parameters in Prefect. Here's an example of how to set up a Prefect flow that accepts dynamic parameters and schedules the flow accordingly:

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python
from prefect import task, Flow
from prefect.schedules import Schedule
from prefect.schedules.clocks import IntervalClock
from datetime import timedelta, datetime

# Define a task that takes a parameter
@task
def parametrized_task(my_param):
    print(f"Task received parameter: {my_param}")

# Define the schedule
schedule = Schedule(clocks=[IntervalClock(interval=timedelta(hours=1))])

# Function to generate dynamic parameter
def generate_dynamic_param():
    # Here you could add any logic to generate the parameter dynamically
    return {"my_param": "dynamic_value"}

# Create the flow
with Flow("Dynamic Parameter Flow", schedule=schedule) as flow:
    # Schedule the task with the dynamic parameter
    scheduled_task = parametrized_task(my_param=generate_dynamic_param())

# Run the flow (for example in a script or via CLI)
if __name__ == "__main__":
    flow.run()

This example uses an

IntervalClock

to schedule the flow to run every hour. You can customize the schedule and the function

generate_dynamic_param

to generate parameters dynamically for each flow run based on your specific requirements. Please note that the specific implementations and features may differ depending on the version of Prefect and whether you are using Prefect 1.x or Prefect 2.x (Orion). Ensure to check Prefect's official documentation or GitHub issues if you encounter any problems or require features specific to the Prefect version you are using.

Marvin

01/25/2024, 7:47 PM

To run a Prefect flow for a list of arguments, you can utilize a loop within your flow definition to create a task for each argument in the list. Here is a simple example of how to do this:

Copy code

python
from prefect import task, Flow

# Define a task that takes a parameter
@task
def parametrized_task(my_param):
    print(f"Task received parameter: {my_param}")

# Your list of arguments
params_list = ["param1", "param2", "param3"]

# Create the flow
with Flow("Flow for List of Arguments") as flow:
    # Schedule the task for each argument in the list
    for param in params_list:
        parametrized_task(my_param=param)

# Run the flow
if __name__ == "__main__":
    flow.run()

This code creates a flow that runs the

parametrized_task

for each item in

params_list

. When

flow.run()

is called, it will execute

parametrized_task

three times with "param1", "param2", and "param3" as arguments for

my_param

. Remember, this is a very simple example and might not handle the concurrency or the dependencies you might have in a complex workflow. However, it should provide a baseline for running tasks with different parameters in a Prefect flow.

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