Variables — the names AI reaches for first

Here's what's about to happen, hundreds of times this year:

You'll ask Cursor to track the user's score, store the API response, or remember the last result. Before it writes a function, before any logic, the very first thing the AI does is invent a variable — a name that holds a value. Every other line in the program then refers back to that name. The whole script flows through these names.

So when you read AI-generated Python — and you will, all day long — most of what you're reading is a constellation of named values being passed around. If you can't read those names, you can't read the code.

The mental model that actually works

Forget "container" and "memory location." Both are technically true and neither is useful. The model that makes Python click is this: labels stuck on values.

Right side first. Python evaluates whatever's on the right of the =. Then it sticks a label — the name — on the result.

score = 7

Read out loud: the value seven, with a label called score stuck on it. Anywhere you later write score, Python looks at the label and finds the seven.

What that buys you when reading AI code

Three things you'll do every time you read code AI wrote you:

1. Trace the flow. When a function returns score, you trace back and ask, "what got score stuck on it?" Almost every AI bug reveals itself here — the label is right but the value behind it is wrong.
2. Predict the type. A name assigned a list comprehension is a list. A name assigned response.json() is a dict. Most "what is this thing?" questions resolve at the assignment line.
3. Spot the rebind. When the same name shows up twice on the left side of =, the second one replaces the first. We'll prove this in two steps.

What's coming in this lesson

Eight short steps. By the end you'll be able to look at any AI-generated Python file and answer two questions in under five seconds: which names are valid? and what value does each one currently point at? That's variable literacy, and the rest of the language stands on it.

The editor on the right already has two lines of Python. Hit Run.