Banking on Romi's Dev Journeyhttps://romisugi.dev/tags/banking/Recent content in Banking on Romi's Dev JourneyHugo -- gohugo.ioen-usSun, 24 Aug 2025 00:00:00 +0000How the Luhn Algorithm Saved Me from Card Number Typos in Pythonhttps://romisugi.dev/posts/python-tips/luhn-algorithm-card-check/Sun, 24 Aug 2025 00:00:00 +0000https://romisugi.dev/posts/python-tips/luhn-algorithm-card-check/<p>Working at a bank, I deal with card numbers every day. I used to just trust that users (or even myself!) would enter the right numbers before sending them off to our APIs. But after a few embarrassing errors and wasted API calls, I discovered a simple trick that changed my workflow: the <strong>Luhn algorithm</strong>.</p> <p>Let me share how this little-known tool saved me time, reduced errors, and made my Python scripts automation smarter!</p>