[PYTHON] Coexistence of Flask logging and other module logging

It seems that the Flask side is set by default_handler of Flask's logger, so you can share it.

my_module.py

from logging import getLogger
logger = getLogger(__name__)

app.py

from logging import DEBUG
from flask.logging import default_handler
import my_module
my_module.logger.setLevel(DEBUG)
my_module.logger.addHandler(default_handler)

app = Flask(__name__)

Ref Logging — Flask Documentation (1.0.x) Logging HOWTO — Python 3.8.1rc1 documentation

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