Real-time data streaming using FastAPI and WebSockets

We have several options for real-time data streaming in web applications. We can use polling, long-polling, Server-Sent Events and WebSockets. The last two can be used for server-push scenarios where we want to send data to a browser without any specific request from the client. All of this solutions have their advantages and disadvantages, so […]

Creating website screenshots with Python and pyppeteer

pyppeteer is a Python port of a headless Chromium browser automation library puppeteer. It is a very useful tool in general and can be used to perform a number of tasks like web scraping, automation and making website screenshots! The advantage of using an actual browser to create website screenshots is clear: it gives us […]

Building command line interfaces in Python

It is very useful to be able to create command line interfaces for our programs. There are several situations in which we want to do that: Building standalone command-line applications like file managers, editors and other full-featured apps Building one-off automated scripts which can run multiple tasks and take complex parameters Creating utility tools that […]

Deployment with Fabric

Fabric is an awesome tool written in Python that we can utilize to execute shell commands on a remote computer via SSH, so any commands we would run locally on our computer we can run on remote servers without much effort. The way this works is that we will create a local utility program where […]

Debugging Python programs

There are different ways to debug Python programs, from printing information to the console using basic print() function to using a full-fledged debugger. In this article we will have a look at some basic tools that we can use, including less known tools like PySnooper or stackprinter. I have created an accompanying repository python-debugging with […]

Measuring Python code complexity with wily

It is good to have some idea about our code complexity. This is especially true for large codebases and large teams where complexity can seriously slow down development and introduce bugs. Every developer probably has some opinion whether a particular code or project is complex, but what if we want to express it with some […]

Flask API Quickstart Application with JSON Web Tokens, SQLAlchemy and Pytest

I created a sample Flask application that shows how to create HTTP API with authentication provided by JSON Web Tokens. It can be used to learn a bit about Flask, SQLAlchemy, JSON Web Tokens, Pytest and how it all works together. In particular, it shows how to: hash passwords using bcrypt issue and verify JWT […]

Rockets: Python-based launch page

It has been 2 years already since I first played with Python and Flask and ended up creating Rockets. At the time, I was learning the basics and wanted to create something useful. Rockets is a very simple, one file Flask application that shows a sign up form for collecting email addresses. It uses only […]