Programming for ML with no experience — if you can type, you can begin
The Reading Mathematical Notation lesson taught you to read Σ as an instruction: start here, stop there, add up whatever sits inside. You could read the symbol out loud, but nothing actually ran. Today it runs. A loop is that same instruction, typed out in Python one line per part instead of one symbol, and by the end of this lesson you will watch the two of them carry out the exact same arithmetic side by side.
🔒 This is a Pro lesson — the interactive figure, worked examples, quiz and practice open with Pro access.
▶ A Loop Is a Σ