Continuous integration (CI) has become essential to software development, allowing teams to merge code changes frequently and catch errors early. Docker containers help facilitate the continuous integration process by providing a consistent environment where you can test and ship code on each commit. In this tutorial, you’ll learn how to use Docker to create a robust continuous integration pipeline for a Flask web application. You’ll go through the steps of developing and testing the application locally, containerizing it, orchestrating containers […]

You’re on a new version of Linux, you try a pip install, and it errors out, talking about “externally managed environments” and “PEP 668”. What’s going on? How do you solve this? Let’s see: What the problem looks like, and what causes it. The places you are likely to encounter it. A variety of solutions, depending on your use case. Symptoms: failed installs Consider the following Dockerfile, using a pre-release of Debian “Bookworm” 12, which will be released in June […]

String concatenation is a common operation in programming. It involves joining two or more strings to create a single new string. You’ll find several tools and techniques for concatenating strings in Python, each with its own pros and cons. In this tutorial, you’ll go through the most common tools and techniques for concatenating strings. You’ll also code examples for each of them, which will help you choose the best option for your specific problems. In this tutorial, you’ll: Understand what […]

Flake8 and PyLint are commonly used, and very useful, linting tools: they can help you find potential bugs and other problems with your code, aka “lints”. But they can also be slow. And even if they’re fast on your computer, they may still be slow in your CI system (GitHub Actions, GitLab, or whatever else.) Happily, there’s a new linter available, Ruff, which is much faster. And it supports many of the same lints, including those from many of Flake8’s […]