Logging Flask errors to console to use it with docker and gunicorn

flask_logging.py

import logging
import flask

app = flask.Flask(__name__)

@app.before_first_request
def setup_logging():
    if not app.debug:
        # In production mode, add log handler to sys.stderr.
        app.logger.addHandler(logging.StreamHandler())
        app.logger.setLevel(logging.INFO)