flask logging gunicorn and file

app.py

from logging.handlers import RotatingFileHandler

from flask import Flask
import logging
from logging import Formatter

app = Flask(__name__)

logger = logging.getLogger('your-logger-name')
file_handler = RotatingFileHandler('test.log', maxBytes=10000, backupCount=1)
handler = logging.StreamHandler()
file_handler.setFormatter(Formatter(
    '%(asctime)s %(levelname)s: %(message)s '
    '[in %(pathname)s:%(lineno)d]'
))
handler.setFormatter(Formatter(
    '%(asctime)s %(levelname)s: %(message)s '
    '[in %(pathname)s:%(lineno)d]'
))
logger.addHandler(file_handler)
logger.addHandler(handler)
logger.setLevel(logging.DEBUG)

@app.route('/')
def hello():
    logger.info('info log')
    logger.debug('debug log')
    logger.error('error log')
    return 'Hello!'

if __name__ == '__main__':
    app.run()

how-to-run.txt

gunicorn run :
$> gunicorn run:app -b localhost:3000 --log-file log_path/access.log --g-level debug --error-logfile log_path/access.log

I have problems using the logger from inside another blueprint. Any idea on how to do it ?