@Marvin how to write tqdm output to prefect logs

The search results from the Prefect documentation didn't return the specific information about integrating tqdm with Prefect logging. However, generally speaking, to redirect tqdm's output to logs, you'd typically need to adjust tqdm's output stream to write to the logger instead of the standard output or error. While I don't have an exact snippet for Prefect specifically, you could potentially customize the tqdm output by creating a custom class or a callback that captures tqdm's output and then redirects it to Prefect's logging system. If you'd like, I can look further into GitHub issues to see if there's any community-contributed code or discussion on this topic. Would you like me to proceed with that?

yes @Marvin

Based on the GitHub issue search, one relevant issue discussing the logging of tqdm progress bars in Prefect tasks can be found here: - Issue titled "Option to log progress and duration estimations" (#8820): This issue describes a feature request to allow the progress of long-running tasks to be logged to Prefect so that the GUI could show the remaining duration. The poster suggests a potential API but does not mention a definitive solution for integrating tqdm with Prefect. It seems like there isn't a built-in way to integrate tqdm with Prefect logging, as per the issues discussed in the Github repository. Implementing this feature is probably something you'd have to handle yourself by customizing tqdm's output or logging within your code. If you decide to go this route, consider using the

prefect.logging

module to access Prefect's logger within your tasks and manually log the progress information captured by tqdm. Alternatively, you may want to follow the discussion on the issue or contribute to the thread to express interest in the feature and to follow any updates on its development.

@Marvin how to connect prefect logger to tqdm

The code example provided does not directly address the question of connecting Prefect's logger to tqdm. However, I can propose a general approach to illustrate how you might redirect output from tqdm to Prefect logs. In Python, you can define a custom writer class that will be used by tqdm to send output to the logger instead of the standard output. Below is a skeleton of how you could approach this:

python
import time
import tqdm
import prefect
from prefect import task, flow

class TqdmToLogger(tqdm.tqdm):
    def __init__(self, logger=None, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._logger = logger or prefect.context.get("logger")

    def write(self, s, *args, **kwargs):
        # You might want to process or filter the log message here
        <http://self._logger.info|self._logger.info>(s)

@task
def my_task():
    logger = prefect.context.get("logger")
    for i in TqdmToLogger(range(10), logger=logger):
        time.sleep(1)  # Simulating work
        pass  # Do something

@flow
def my_flow():
    my_task()

if __name__ == "__main__":
    my_flow()

This custom

TqdmToLogger

class inherits from

tqdm

and overrides the

write

method to send messages to Prefect's logger instead of the standard output. When you create a progress bar instance, you pass Prefect's logger to it. When tqdm normally prints progress updates, it will call

write

, and thus in this case, those updates will go to your logs. Keep in mind, the example above is a simplified illustration and may require adjustment based on the actual behavior of tqdm progress bars you want to capture and the specifics of Prefect's logging configuration in your environment. The

log_prints=True

decorator option in the code example provided ensures that

print

statements are logged at the INFO level, which is another way to send output to logs, but this approach is not specific to tqdm. Unfortunately, Prefect lacks a documented, built-in method for connecting tqdm directly to its logging system, and any implementation would require a custom solution like the one described above.