from loguru import logger

# Only write messages from "a" logger
logger.add("a.log", filter=lambda record: record["extra"].get("name") == "a")
# Only write messages from "b" logger
logger.add("b.log", filter=lambda record: record["extra"].get("name") == "b")

logger_a = logger.bind(name="c")
logger_b = logger.bind(name="d")

logger_a.info("Message A")
logger_b.info("Message B")