How NOT to write pandas code

I've never seen a Pandas tutorial advocating the for-loops the author describes and I have rarely come across for-loops in other people's Pandas code. I think the article could remove the for-loop "how not to" examples and it would be a typical "getting started with Pandas" article.

The title is a bit clickbaity, so here’s a TL;DR:<p>Try to use the built-in vectorized Pandas functions instead of writing explicit loops.