@Marvin I have an artifact for a certain flow, I'd like to append string data to this artifact from several tasks as the flow executes, is that possible?

To provide the best assistance, I need to confirm or infer which version of Prefect you are using. Can you please specify whether you're using Prefect 2.x, 3.x, or another version?

@Marvin 3.x

In Prefect 3.x, you can create and update artifacts during a flow's execution, including appending or modifying data from multiple tasks. Here's how you can manage artifacts: 1. Creating Artifacts: You can create different types of artifacts such as table, link, or Markdown using functions like

create_table_artifact

,

create_link_artifact

, or

create_markdown_artifact

. 2. Updating Artifacts: To update an artifact, you can use a function like

update_progress_artifact

. Prefect allows you to update a progress artifact directly, while other types may require creating new versions or handling updates through specific artifact functions. For your case of appending string data from multiple tasks to a single artifact, you might use a

create_markdown_artifact

and control the content updates in a coordinated manner, ensuring string data is accumulated and updated as desired. Here are some practical steps you can follow: - Initialize the Artifact: At the beginning of your flow, create a base artifact that will hold the data. Use a unique key to manage its versions or track its updates. - Update Artifact in Tasks: Within each task, append your data and optionally update the artifact by calling the appropriate Prefect function to append the string data to the existing artifact. For more details on using and managing artifacts, you can refer to the Prefect 3.x Artifacts Documentation. Let me know if you need a specific code example or further clarification!

hi @Doug Applegate - something was off about this app mention, not sure but its like a different color so I dont think the short answer yes, you can overwrite the same

key

of an artifact as much as you want but in order to actually "append", each time you'd write, you'd have to do • what is the current value associated with this artifact? • ok the new value should be

f"{old_value} {new_value}"

or whatever your example looks like so im not sure what your runtime is like, but if it were on disk or you're free to use s3 or something, i might instead have all the tasks place their result in some shared state and then write the shared state as an artifact at the end of the flow