I m trying to write a flow that creates a number of sub flow

Question

I m trying to write a flow that creates a number of sub flows and running into some issues getting Prefect to register it would appreciate some guidance example in thread

Max Kolasinski · Answer

Following <https docs prefect io core idioms flow to flow html running a parametrized flow> as a baseline my flow basically looks like ```def get tasks return task1 task2 with Flow my flow as flow task list = get tasks for task in task list flow run = create flow run flow name= task project name= task parameters=task ``` On first attempt the Prefect registrar told me that Tasks are not iterable fair enough so I instead tried to iterate on `task list result` and I m being told that NoneType isn t iterable either Is there a way to inform the registrar of the type that I m expecting to get returned or otherwise some way of tricking the process into accepting the flow Or am I trying to do something that shouldn t be done

Kevin Kho · Answer

So `task list` is not an iterable when the Flow is being built It is of type Task so you can t iterate over it The value into becomes an iterable during runtime So the paradigm here would be to use mapping ```with Flow my flow as flow task list = get tasks create flow run map flow name= task project name= task parameters=task ``` and that it like a for loop In general you can t use non task native Python in the Flow like `if` `while` etc

Max Kolasinski · Answer

This worked out perfectly thanks so much