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➡️ Try Lokalise today: https://bit.ly/arjancodes. In this video, I’m going to show you the main principles I use to write code that’s less likely to fail, with of course plenty of Python examples. Watch to find out how to avoid writing brittle functions in Python. 💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. 🔥 GitHub Repository: http://git.arjan.codes/2025/brittle. 🎓 ArjanCodes Courses: https://www.arjancodes.com/courses. 💬 Join my Discord server: https://discord.arjan.codes. ⌨️ Keyboard I’m using: https://amzn.to/49YM97v. 🔖 Chapters: 0:00 Intro 0:29 Do Not Check Type Constraints 11:09 Value Constraints 14:21 Optional Values 16:40 Returning None 19:41 Final thoughts 20:33 Outro #arjancodes #softwaredesign #python