Python to AI · Episode 05 — Functions: Building Blocks
Turn 12 lines of copy-pasted code into 5 lines with a function. Learn def, return, parameters, defaults, *args, scope, lambdas, and the one "silent None" trap that breaks every beginner's first real function. We finish by refactoring last episode's guessing game into three clean named functions.
This is Episode 5 of Python to AI — a free 72-episode course taking you from zero to building AI agents and production AI systems.
TIMESTAMPS:
0:00 — Hook · 12 lines → 5 lines
0:32 — Chapter roadmap
0:44 — Why functions · DRY + readability
2:28 — Anatomy · the six parts of a function
4:20 — Parameters · in · Return · out
6:11 — Defaults & *args
8:11 — Scope + the silent-None trap 💥
10:15 — Lambda & higher-order functions
11:45 — Refactor · EP04's guessing game into 3 functions
13:50 — Closing · Module 1 almost done
CODE: https://github.com/[your-username]/python-to-ai/tree/main/module-01-python-foundations/ep05-functions
FULL COURSE PLAYLIST: [playlist link]
PREVIOUS EPISODE: EP04 — Control Flow
NEXT EPISODE: EP06 — Data Structures: Lists, Dicts, Sets
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