All articles tagged #flask

Python is booming and Flask is a pretty popular web-framework nowadays. Probably, quite some new projects are being started in Flask. But people should be aware, it's synchronous by design and ASGI is not a thing yet. So, if someday you realize that your project really needs asynchronous I/O but you already have a considerable codebase on top of Flask, this tutorial is for you. The charming gevent library will enable you to keep using Flask while start benefiting from all the I/O being asynchronous. In the tutorial we will see:

How to monkey patch a Flask app to make it asynchronous w/o changing its code.
How to run the patched application using gevent.pywsgi application server.
How to run the patched application using Gunicorn application server.
How to run the patched application using uWSGI application server.
How to configure Nginx proxy in front of the application server.
[Bonus] How to use psycopg2 with psycogreen to make PostgreSQL access non-blocking.

Save the day with gevent

April 17, 2019 (Updated: October 9, 2021)

Programming

One day you were hired by a startup to build yet another web ~~site~~ service. The problem sounded similar to numerous back-ends you had been doing before. So, you decided to move with python to be conservative enough and pick flask to be lightweight but yet powerful enough. Nobody was fired for ~~buying IBM~~ starting things in python, wise man's choice.