Console output from loguru seems to bypass the buffering IPython does to keep its user prompt pinned to the bottom, so you get this:

In [1]: 2025-09-23 16:29:39.811 | INFO     | __main__:background_logger:13 - Log message 1
2025-09-23 16:29:40.812 | INFO     | __main__:background_logger:13 - Log message 2
2025-09-23 16:29:41.812 | INFO     | __main__:background_logger:13 - Log message 3
In [2]:

This does not happen with std logging structlog using the defaults, which uses print() to render to console. The behaviour is the same std logging.

Reproduce with:

import threading
import time

import IPython
from loguru import logger


def background_logger():
    count = 0
    while count < 3:
        time.sleep(1)
        count += 1
        logger.info(f"Log message {count}")


threading.Thread(target=background_logger, daemon=True).start()

IPython.embed()

Is there any way to make this work nicely?