Python’s built-in function sum() is an efficient and Pythonic way to sum a list of numeric values. Adding several numbers together is a common intermediate step in many computations, so sum() is a pretty handy tool for a Python programmer. As an additional and interesting use case, you can concatenate lists and tuples using sum(), which can be convenient when you need to flatten a list of lists. In this tutorial, you’ll learn how to: Sum numeric values by hand […]

Python 3.10 is out! Volunteers have been working on the new version since May 2020 to bring you a better, faster, and more secure Python. As of October 4, 2021, the first official version is available. Each new version of Python brings a host of changes. You can read about all of them in the documentation. Here, you’ll get to learn about the coolest new features. In this tutorial, you’ll learn about: Debugging with more helpful and precise error messages […]

If you’re using GitLab CI to build your software, you might also want to use it to build Docker images of your application. This can be a little tricky, because by default GitLab CI runs jobs inside Docker containers. The standard technique for getting around this problem is using Docker-in-Docker, but you can also use a simpler technique by using Podman, the reimplemented version of Docker. Let’s see why and how. Option #1: Docker-in-Docker When you run the docker command-line […]

As a novice web developer, you’ve built your portfolio app and shared your code on GitHub. Perhaps, you’re hoping to attract technical recruiters to land your first programming job. Many coding bootcamp graduates are likely doing the same thing. To differentiate yourself from the crowd and boost your chances of getting noticed, you can start hosting your Django project online. For a hobby Django project, you’ll want a hosting service that’s free of charge, quick to set up, user-friendly, and […]

When you’re using Python strings often in your code, you may face the need to work with them in reverse order. Python includes a few handy tools and techniques that can help you out in these situations. With them, you’ll be able to build reversed copies of existing strings quickly and efficiently. Knowing about these tools and techniques for reversing strings in Python will help you improve your proficiency as a Python developer. In this tutorial, you’ll learn how to: […]

You don’t want to deploy an application that has security vulnerabilities. That means your own code, but also third-party dependencies: it doesn’t matter how secure your code is if it’s exposing a TLS socket with a version of OpenSSL that has a remote code execution vulnerability. For pip-based Python applications, you’d usually run vulnerability scanners on Python dependencies like Django, and on system packages like OpenSSL. With Conda, however, the situation is a little different: Conda combines both types of […]