https://belazy.dev/ Recent content on belazy.dev Hugo -- gohugo.io en © 2026 Grzegorz Kocjan Wed, 15 Jul 2026 00:00:00 +0000 https://belazy.dev/posts/4-levels-of-mastering-type-annotations-in-python/ Mon, 02 Oct 2023 00:00:00 +0000 https://belazy.dev/posts/4-levels-of-mastering-type-annotations-in-python/ Type annotations have been with us, Python developers, for a long time. https://belazy.dev/posts/asserting-field-from-the-response/ Sat, 11 Mar 2023 00:00:00 +0000 https://belazy.dev/posts/asserting-field-from-the-response/ Let’s assert a field from the response. https://belazy.dev/talks/the-hardest-test-suite-i-ever-built/ Wed, 15 Jul 2026 00:00:00 +0000 https://belazy.dev/talks/the-hardest-test-suite-i-ever-built/ Enjoyed this talk? https://belazy.dev/build-your-talk/ Mon, 13 Jul 2026 00:00:00 +0000 https://belazy.dev/build-your-talk/ You know things worth sharing. https://belazy.dev/places/euro-python-2026/ Mon, 13 Jul 2026 00:00:00 +0000 https://belazy.dev/places/euro-python-2026/ Euro Python 2026 in Kraków https://belazy.dev/places/pys-2025/ Mon, 03 Nov 2025 00:00:00 +0000 https://belazy.dev/places/pys-2025/ Conference for developers, data engineers, architects, DevOps and anyone interested in the Python language https://belazy.dev/places/pyconpl-2025/ Fri, 29 Aug 2025 00:00:00 +0000 https://belazy.dev/places/pyconpl-2025/ PyConPL 2025 in Gliwice https://belazy.dev/places/euro-python-2025/ Wed, 16 Jul 2025 00:00:00 +0000 https://belazy.dev/places/euro-python-2025/ Euro Python 2025 in Prague https://belazy.dev/places/python-lodz-58/ Sun, 25 May 2025 00:00:00 +0000 https://belazy.dev/places/python-lodz-58/ Local Polish meetup held in Lodz https://belazy.dev/places/wdi-2025/ Mon, 31 Mar 2025 00:00:00 +0000 https://belazy.dev/places/wdi-2025/ Warsaw IT Days is an iconic event for the Polish IT and Data Science community, which gathers over 10.000 participants every year. https://belazy.dev/talks/python-config-that-will-give-you-chills-in-a-good-way-i-promise/ Sun, 30 Mar 2025 00:00:00 +0000 https://belazy.dev/talks/python-config-that-will-give-you-chills-in-a-good-way-i-promise/ Description # Configuration. https://belazy.dev/talks/from-zero-to-production-practical-tdd/ Thu, 01 Aug 2024 00:00:00 +0000 https://belazy.dev/talks/from-zero-to-production-practical-tdd/ Description # Is there a perfect way to create new services? https://belazy.dev/trainings/practical-tdd-in-modern-python/ Fri, 12 Jan 2024 00:00:00 +0000 https://belazy.dev/trainings/practical-tdd-in-modern-python/ Why Choose This Workshop? https://belazy.dev/talks/zen-of-it-the-secrets-of-sleeping-well-at-night/ Thu, 02 Mar 2023 00:00:00 +0000 https://belazy.dev/talks/zen-of-it-the-secrets-of-sleeping-well-at-night/ The title is a lie because as a father of two very small kids, I never sleep well. https://belazy.dev/talks/a-tale-of-long-living-feature-branches-and-why-to-avoid-them/ Wed, 01 Mar 2023 00:00:00 +0000 https://belazy.dev/talks/a-tale-of-long-living-feature-branches-and-why-to-avoid-them/ Once upon a time, in December 2022, two talented developers, named Grzegorz K. https://belazy.dev/learn-tdd/ Mon, 20 Feb 2023 00:00:00 +0000 https://belazy.dev/learn-tdd/ What is TDD # TDD is a great tool to learn if you want to improve your coding skills. https://belazy.dev/about/ Fri, 11 Nov 2022 00:00:00 +0000 https://belazy.dev/about/ My name is Grzegorz Kocjan. https://belazy.dev/talks/test-driven-pandas/ Wed, 02 Nov 2022 00:00:00 +0000 https://belazy.dev/talks/test-driven-pandas/ Writing code in pandas without jupyter? https://belazy.dev/talks/be-lazy-write-tests/ Wed, 06 Apr 2022 00:00:00 +0000 https://belazy.dev/talks/be-lazy-write-tests/ Almost all developers want to code in TDD but only a few do. https://belazy.dev/talks/how-to-git-blame-efficiently/ Fri, 22 Nov 2019 00:00:00 +0000 https://belazy.dev/talks/how-to-git-blame-efficiently/ During the presentation, you will see how to create an art gallery for our code. https://belazy.dev/talks/dont-start-with-a-database/ Fri, 12 Jul 2019 00:00:00 +0000 https://belazy.dev/talks/dont-start-with-a-database/ What you do when you start a new project?