Python Web Development with Flask — Logging and Config

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Flask is a simple web framework written in Python.

In this article, we’ll look at how to develop simple Python web apps with Flask.

Logging

We can add logging into our Flask app.

For example, we can write:

from flask import Flask, abort
from logging.config import dictConfig
dictConfig({
    'version': 1,
    'formatters': {'default': {
        'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s',
    }},
    'handlers': {'wsgi': {
        'class': 'logging.StreamHandler',
        'stream': 'ext://flask.logging.wsgi_errors_stream',
        'formatter': 'default'
    }},
    'root': {
        'level': 'INFO',
        'handlers': ['wsgi']
    }
})
app = Flask(__name__)
@app.route('/')
def hello_world():
    app.logger.info('success')
    return 'hello'

to configure our logger and use it.

The dictConfig function lets us configure our logger.

version is an integer value representing the schema version.

formatters has the dictionary top construct a Formatter instance.

filters is a dict which each key is a filter id and each value is a dict describing how to…