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Configure logging in flask applications

Project Description

This is a handy flask extension for setting up logging for your application that is super simple to setup. A basic example is:

import flask
from flask.ext.log import Logging

app = flask.Flask(__name__)
app.config['FLASK_LOG_LEVEL'] = 'DEBUG'
flask_log = Logging(app)

app.logger.debug('Testing a debug message')

So the level of logging is configurable through regular flask configuration methods. Additionally, since we are setting up the root logger, you can use whatever logger you want as you aren’t restricted to the flask application logger. i.e. something like:

import logging

log = logging.getLogger('my-special-logger')
log.critical('Oh my!')

will also keep the formatter and level if the extensions has been initialized anywhere.


  • Sets up syslog handling to either /dev/log, /var/run/syslog, or on UDP port 514 depending on what is available.

  • Adds a log formatter packed with information and by default produces output like: [2015-03-31 18:10:17,816] CRITICAL 42282 [__main__] - [my_hostname] - Hi

  • Full code coverage

  • The log formatter can be overidden with something like:

    flask_logger = Logging(app)
    flask_logger.set_formatter('Log message follows: %(message)s')

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Source None Apr 6, 2015

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