loguru how to change level like setLevel() in logging module

[zhouxiaomao]

code sample:

logger.add("file.log", format=fmt, enqueue=True, level="WARNING")
logger.warning("xxxxx")
do_others()

here now I want to set level to DEBUG

logger.debug("11111")
logger.info("aaaaa")

debug,info message can output.

[Delgan]

Hello @zhouxiaomao.

It is not possible to modify the level of an handler once it has been added. There is several solutions, though.

You can remove an handler and restart it with updated level:

i = logger.add("file.log", format=fmt, enqueue=True, level="WARNING")
...
logger.remove(i)
logger.add("file.log", format=fmt, enqueue=True, level="DEBUG")

Alternatively, you can use a dynamic filter combined with .bind():

def my_filter(record):
    if "warn_only" in record["extra"]:
        return record["level"].no >= logger.level("WARNING").no
    return True

logger.add("file.log", format=fmt, enqueue=True, level="DEBUG", filter=my_filter)

# Use this logger first, debug messages are filtered out
warn_logger = logger.bind(warn_only=True) 

# Then you can use this one to log all messages
logger.debug("Blabla")

Or by using just one logger with a more advanced filter:

class MyFilter:

    def __init__(self, level):
        self.level = level

    def __call__(self, record):
        levelno = logger.level(self.level).no
        return record["level"].no >= levelno


my_filter = MyFilter("WARNING")
logger.add(sys.stderr, "file.log", format=fmt, enqueue=True, filter=my_filter, level=0)
logger.warning("OK")
logger.debug("Nope")
my_filter.level = "DEBUG"
logger.debug("OK")

[zhouxiaomao]

Thank you for your detailed explaination. I get it and try.