Day 39 · Python building blocks 50 min 40 XP

🔁Lists, dictionaries, loops and functions

Real data comes in collections. Lists and dictionaries hold them, loops walk through them and functions package the steps so you never repeat yourself. This is all pandas quietly builds on.

What you'll learn

Store and index values in lists and dictionaries
Loop with for and branch with if
Write a function and a list comprehension

A peek inside

Lists and dictionaries

The rest of Day 39 is a Pro lesson

You're on the free Explorer plan — you get the intro and the video. Go Pro to open the full guided lesson (and all 30 days).

3 deep-dive lessons
A copy-paste worked example
3 hands-on practice tasks
Studio task: Count and convert with plain Python
3-question quiz, up to 45 XP
4 quick-glance glossary cards
40 XP + streak tracking

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