Python Variables

A variable is a labeled drawer.

You put something inside. Later you open it by name.

The label stays. The thing inside can change.

In Python you make a variable with a name, an equals sign, and a value.

Creating a variable

Write the name on the left.

Write the value on the right.

The = means put this value in that drawer.

Updating a value

You can replace what is in the drawer.

Use the same name again with a new value.

Or use the old value to make a new one.

Naming rules

Names can use letters, numbers, and underscores.

A name cannot start with a number.

Spaces are not allowed in a name.

Many names at once

You can fill a few drawers on one line.

Only do this when it stays easy to read.

Same name, new kind of thing

Python lets you put a number in a drawer today.

Tomorrow you can put text in the same drawer.

That works, but keep your story clear.

Reading a variable

When you write the name, Python looks in that drawer.

print shows what it found.

Tip: Clear names beat short secret codes. Your future self will thank you.