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Lambda in a Loop is a Code Smell

Watch out for smelly code! A common mistake in Python is to use a lambda function inside of a loop. While it's not always a problem, it should set off your senses to take a second look when you see a lambda inside a loop. If the lambda references a loop variable, you might not realize that the way that closures (or cell variables) work in Python means the lambda doesn't store the latest value of a variable that was present when the lambda is created. In this video I walk through a simplified real-world-code example where I made this mistake myself, including how to fix it. ― mCoding with James Murphy (https://mcoding.io) Source code: https://github.com/mCodingLLC/VideosS... Closures video:    • Functions within functions, closures,...   Local vs global lookup video:    • Local and Global Variable Lookup Weir...   SUPPORT ME ⭐ --------------------------------------------------- Sign up on Patreon to get your donor role and early access to videos!   / mcoding   Feeling generous but don't have a Patreon? Donate via PayPal! (No sign up needed.) https://www.paypal.com/donate/?hosted... Want to donate crypto? Check out the rest of my supported donations on my website! https://mcoding.io/donate Top patrons and donors: Jameson, Laura M, Dragos C, Vahnekie, Neel R, Matt R, Johan A, Casey G, Mark M, Mutual Information, Pi BE ACTIVE IN MY COMMUNITY 😄 --------------------------------------------------- Discord:   / discord   Github: https://github.com/mCodingLLC/ Reddit:   / mcoding   Facebook:   / james.mcoding   CHAPTERS --------------------------------------------------- 0:00 Intro 0:12 What is a code smell? 0:43 Sponsoring myself! 1:11 Example setup 2:49 The symptoms 4:02 Why the lambda in a loop is bad 5:00 The partial fix 5:59 Exceptions to the rule 7:15 Prevent this before it ever happens 8:00 Thanks