@Marvin create an example of an async prefect flow (for prefect 3.0) that has a chain of tasks as follow: • a setup task • three tasks that run concurrently: verify_color, verify_weight, verify_size. Each task returns true/false • a summarize task that waits for the previous 3 tasks to finish, and returns true if all 3 tasks returned true

Here's an example of how you can create an asynchronous Prefect 3.0 flow with the specified task structure:

python
from prefect import flow, task

@task
async def setup():
    # Simulate setup work
    print("Setting up...")
    return "Setup complete"

@task
async def verify_color():
    # Simulate verification
    print("Verifying color...")
    return True

@task
async def verify_weight():
    # Simulate verification
    print("Verifying weight...")
    return True

@task
async def verify_size():
    # Simulate verification
    print("Verifying size...")
    return True

@task
async def summarize(color_verified, weight_verified, size_verified):
    # Summarize the results
    print("Summarizing results...")
    return color_verified and weight_verified and size_verified

@flow
async def verification_flow():
    setup_result = await setup()
    print(setup_result)

    # Run verification tasks concurrently
    color_result, weight_result, size_result = await verify_color(), await verify_weight(), await verify_size()

    # Summarize the results
    summary_result = await summarize(color_result, weight_result, size_result)
    print(f"Summary result: {summary_result}")

# Execute the flow
verification_flow()

This example demonstrates how to define an asynchronous flow with tasks that run concurrently using Prefect 3.0. Each of the verification tasks (

verify_color

,

verify_weight

,

verify_size

) runs independently, and the

summarize

task waits for their completion before evaluating the results. For more information on Prefect's asynchronous features, you can refer to the Prefect documentation.