Two line logged for each statement?

from loguru import logger
logger.add(sys.stdout, colorize=True, backtrace=True, diagnose=True, format="<green>{time}</green> <level>{message}</level>")

if __name__ == "__main__":
    txt = "This is test text"
    logger.debug("{}", txt)
    logger.debug("End")

My terminal output looks like

Not sure why it wants to output two rows per log

[Delgan]

@jamesstidard The standard logging is not always straightforward to work with, I would blame that instead. 😄

It seems you need first to remove the Sanic’s handler:

logging.getLogger("sanic.root").handlers.clear()

For some libraries, this extra-step is not required. I’m not sure of why, I guess it depends on how these libraries configure logging internally. Sanic seems to attach their own stderr handler to logging.getLogger("sanic.root"). There is a bit of documentation there: Sanic Logging

[jamesstidard]

@Delgan ah, that makes a lot of sense. Sorry, I didn’t think to check out the doc string on the function apparently… probably should have figured that out.

Not to take advantage of your good will, but adding the remove call does indeed get rid of the duplicate lines, but not the ones I was hoping 😃

import logging

from loguru import logger

from sanic import Sanic
from sanic.response import json

# Redirect all logging to loguru
class InterceptHandler(logging.Handler):
    def emit(self, record):
        # Retrieve context where the logging call occurred, this happens to be in the 6th frame upward
        logger_opt = logger.opt(depth=6, exception=record.exc_info)
        logger_opt.log(record.levelno, record.getMessage())

# logger.remove()
logging.basicConfig(handlers=[InterceptHandler()], level=0)

app = Sanic()

@app.route('/')
async def test(request):
    return json({'hello': 'world'})

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8000)

Without the remove line this outputs:

[2019-07-26 10:44:35 +0100] [17811] [INFO] Goin' Fast @ http://0.0.0.0:8000
2019-07-26 10:44:35.242 | Level 20 | sanic.app:_helper:1383 - Goin' Fast @ http://0.0.0.0:8000
[2019-07-26 10:44:35 +0100] [17811] [INFO] Starting worker [17811]
2019-07-26 10:44:35.248 | Level 20 | sanic.server:serve:802 - Starting worker [17811]

With the remove line, it drops the pretty loguru ones in favor of the default. It’s still the morning here so I’ll continue to blame it on that 😃

Thanks for the help.