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