<@ULVA73B9P> How can I update a task_run_name dyn...
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p
@Marvin How can I update a task_run_name dynamically when I call the task inside a for loop with in a flow. PS : I am using .submit() method to activate the task concurrently
m
To dynamically update a
task_run_name
in Prefect when using the
.submit()
method, you can use templated references in the
task_run_name
parameter or provide a function to generate the task run name. This feature is similar in both Prefect 2.x and 3.x versions. Here's a simple method you can use: 1. Using Templated Strings: You can define a task with a
task_run_name
parameter that uses Python's string formatting to insert values dynamically. 2. Using a Function: You can also define a function that returns the task's run name. This function can be passed to the
task_run_name
parameter of your task decorator. For instance, if your task takes a parameter like
name
and
date
, you can customize the task run name as follows:
Copy code
python
from prefect import flow, task
import datetime

@task(name="My Example Task", task_run_name="Task for {name} on {date:%A}")
def my_task(name, date):
    pass

@flow
def my_flow():
    names = ["Alice", "Bob", "Charlie"]
    for name in names:
        my_task.submit(name=name, date=datetime.datetime.now(datetime.timezone.utc))

if __name__ == "__main__":
    my_flow()
In this example, the task run names will be something like "Task for Alice on Monday", depending on the day of the week when it runs. For more details, you can refer to the documentation: - Prefect 2.x documentation: Task Concepts - Prefect 3.x documentation: Writing Tasks Let me know if you need any further assistance!
n
@Marvin with_options might be useful here
m
To dynamically update a
task_run_name
using the
.with_options()
method in Prefect, you can customize this parameter directly when you submit the task within a loop. Using
.with_options()
, you can override the task's default configurations, such as the
task_run_name
. Here’s how you can do this: 1. Use
with_options
to customize
task_run_name
: You can apply
with_options()
on a task to change the
task_run_name
for each iteration in your loop. Here's an example:
Copy code
python
from prefect import flow, task
import datetime

@task(name="My Task")
def my_task(name, count):
    print(f"Running task for {name}, count {count}")

@flow
def my_flow():
    names = ["Alice", "Bob", "Charlie"]
    for i, name in enumerate(names):
        my_task.with_options(
            task_run_name=f"Task-{name}-{i}"
        ).submit(name=name, count=i)

if __name__ == "__main__":
    my_flow()
In this example, the
task_run_name
will be different for each task run, formatted with the name and count index, such as "Task-Alice-0", "Task-Bob-1", etc. For more information, you can refer to the Prefect 2.x and 3.x documentation: - Prefect 2.x: The Tasks Concepts document. - Prefect 3.x: The Task Configuration document. Feel free to ask more questions if needed!