@Marvin how do I use a task's wait_for to wait for a task that has been conditionally created? For example if I have task A that is either created or not based on some logic, and task B that should only run if task A has been completed or if task A was never scheduled, how would I write that code?

I found some relevant information and examples for your question: 1. Example of Task Wait For: Here's a link to a code example that demonstrates basic usage of tasks in Prefect: https://raw.githubusercontent.com/zzstoatzz/prefect-code-examples/main/examples/tasks/basic.py 2. Conditional Task Creation and Wait Logic: To achieve conditional task creation and have another task wait for it, you can use Prefect's task and flow control features. Here's a structured way to implement this logic:

python
from prefect import flow, task
from prefect.tasks import Task

@task
def conditionally_create_task(condition: bool) -> Task:
    if condition:
        @task
        def task_a():
            print("Task A is running")
        return task_a
    return None

@task
def task_b():
    print("Task B is running")

@flow
def main_flow(condition: bool):
    task_a = conditionally_create_task(condition)
    if task_a:
        task_b.wait_for(task_a())
    else:
        task_b()

if __name__ == "__main__":
    main_flow(True)  # or main_flow(False) based on the condition

In this example,

conditionally_create_task

returns

task_a

if the condition is true, otherwise, it returns

None

. The

main_flow

then checks if

task_a

was created and uses

task_b.wait_for(task_a())

to wait for its completion, or runs

task_b

directly if

task_a

was not created. For more details on task control and advanced usage in Prefect, refer to the official documentation: https://docs.prefect.io/latest/concepts/tasks/ If you need more specific guidance or examples, feel free to ask!

Simple enough. Thanks Marvin.