Running post tasks even if the main task fail

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
cli

Research direction

Start by tracing how pre and post tasks are executed around main_task and how unhandled exceptions propagate. Define the failure-path behavior so my_post_task performs cleanup after main_task fails, then verify both successful and failing task runs.

Written by the indexing model from the issue text.

Description

Hello. I was wondering if there's a way to make sure that a post task runs even if the main task fails with an unhandled exception? Here's a simplified version of my code to illustrate the issue:

@task()
def my_pre_task(ctx):
    # Do some resource provisioning needed by the task


@task()
def my_post_task(ctx):
    # Perform resource cleanup
    # This should always run, but it won't if the main task fails with an unhandled exception


@task(pre=[my_pre_task], post=[my_post_task])
def main_task(ctx):
    # Do something that could also result in an unhandled exception

I know that I can wrap the main_task in a try/finally, but I'd rather not do this if I can find a more elegant solution. I was hoping there was something like post_run_on_failure=True that I could use, or a finally task that behaves like a post but always run.

Dominant language
Python
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