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Title
b
Bruno Murino
06/30/2021, 2:03 PMHi everyone — I have a task that returns a python dictionary, now I’m trying to use one of the elements of the dictionary as input for another task, but I’m getting an error.. Here’s a minimal working example:
import prefect
from prefect import task, Flow, Parameter, unmapped, case
from prefect.tasks.shell import ShellTask
shell_task = ShellTask(stream_output=True)
@task
def get_config():
return {
'path': '/root/',
}
with Flow("test") as flow:
config = get_config()
bar = shell_task(command="pwd", helper_script = f"cd {config['path']}")
flow.run()k
Kevin Kho
06/30/2021, 2:06 PMHey @Bruno Murino, tasks execution is deferred but that dictionary call is done during build time. So there won’t be
config['path']configpathb
Bruno Murino
06/30/2021, 2:06 PMhmmmmm, let me try that!
it worked! I ended up just enclosing a “shell_task.run()” inside another task, and I only pass the full config object to it and deal with that inside the task — I found this cleaner and more consistent with how I do other tasks
👍 1
✅ 1
k
Kevin Kho
06/30/2021, 2:20 PMYou can also do this in the flow:
task(lambda _x_: x['path'])(config)👍 1