Hi, is there a way to set one

Parameter

as the default for another? Here's what I did

#task 
@task(target= {output_folder_path}/result)
def example_task(output_folder_path)
....

#in flow
step1_folder_path = Parameter("step1_folder_path")
output_folder_path = Parameter("output_folder_path", default = step1_folder_path)

When I do this, I got a warning

<ipython-input-226-3b472991f1ef>:8: UserWarning: A Task was passed as an argument to Parameter, you likely want to first initialize Parameter with any static (non-Task) arguments, then call the initialized task with any dynamic (Task) arguments instead. For example:

  my_task = Parameter(...)  # static (non-Task) args go here
  res = my_task(...)  # dynamic (Task) args go here

see <https://docs.prefect.io/core/concepts/flows.html#apis> for more info.
  output_folder_path = Parameter("output_folder_path", default = step1_folder_path)

When I execute the flow, it runs but the

target

doesn't work as intended, the task still runs every time even though the target files are there. When I provide a hardcoded string to the default of

output_folder_path

, everything works fine

There is no way to do this because Parameters defaults are registered during build time, and the value doesn’t exist then yet. You need to set the default of

output_folder_path

to

None

make another task that checks for the

output_folder_path

to see if it’s

None

and then grab

step1_folder_path

.