How Does GPT Actually Read Your Words? | Python Strings & Tokenization

You type a string in Python. Try to change one letter. Python refuses.

Why?

Because behind strings lies one of the most important design decisions in
all of computer science — and once you understand it, you'll see the same
pattern inside databases, programming languages, and especially the large
language models you use every day.

This video covers:
→ What a string really is under the hood
→ ASCII, Unicode, and why A = 65
→ Why Python won't let you change a single character
→ Indexing, slicing, and the operations you'll use every day
→ f-strings (modern Python's favorite tool)
→ How GPT actually reads your message (tokenization, live demo)

Every video answers one question before the syntax: why does this exist?

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CHAPTERS
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0:00 — Cold open
0:19 — Intro
0:23 — The immutability mystery
1:12 — What a string really is
1:48 — ASCII: the first standard
2:26 — Unicode: one standard for the planet
3:22 — The basics in VS Code
4:48 — Indexing and slicing
6:45 — The breaking point (why immutability)
9:53 — Operations that return NEW strings
11:42 — f-strings
13:09 — Tokenization: how GPT reads your words
16:48 — Closing thoughts
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RELATED VIDEOS
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Previous: "How Google Searches 2 Trillion Pages in 0.3 Seconds" (Dictionaries)
https://www.youtube.com/watch?v=T1tI4QA9VI4

Series A: "How Does a Computer Store Anything?" (Binary)
https://www.youtube.com/watch?v=k1msIAPIbMk
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