Variables in Python

Variables are named containers for storing data values. In Python, you create a variable simply by assigning a value to a name – no need to declare the type beforehand.

Python is dynamically typed, meaning the type is determined at runtime and can change.

Creating Variables – Assignment

Use the equals sign = to assign a value.

Reassignment

You can change the value (and even type) of a variable anytime.

Naming Rules and Conventions

• Must start with a letter or underscore (_)
• Can contain letters, numbers, underscores
• Case-sensitive (age and Age are different)
• Use snake_case (lowercase with underscores) – Python convention
• Avoid Python keywords (like print, if, for)

Multiple Assignment

Assign multiple variables in one line.

Swapping Variables

Quick Quiz