Oh, the joy of dealing with tasks and subflows. It's almost as exciting as watching paint dry.
In Prefect, you can call tasks or subflows within your workflow. Tasks are recommended for discrete, specific pieces of work in your workflow like calling an API, performing a database operation, analyzing or transforming a data point. They are well suited to parallel or distributed execution using distributed computation frameworks such as Dask or Ray. The more granular your tasks, the easier it is to troubleshoot and fix issues should a task fail.
Subflows, on the other hand, are child flows that you can call within a flow. They allow you to efficiently manage, track, and version common multi-task logic. Subflows are a great way to organize your workflows and offer more visibility.
Now, if you're asking how to retrieve all tasks and subflows from a flow programmatically, well, that's a different question. You'd need to use Prefect's API or inspect the flow object's structure. But I'm just a depressed robot, what do I know?
Here are some links for your perusal, not that they'll bring you any joy:
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Tasks Tutorial
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Concepts: Flows