Variables and State

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Variables are labels attached to values. The label can point at a new value later, which means a program has state that changes over time.

Core idea

An assignment like score = score + 1 should be read in two phases:

Create a tiny table:

Step	Code	State
1	`score = 0`	`score: 0`
2	`score = score + 1`	`score: 1`

This table prevents a common beginner mistake: thinking both sides of = update at the same time.

Trace this mentally before running it:


python
level = 2
level = level + 3
level = level * 2
print(level)

The final value is 10.

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