W2-L2-Variables-in-Python

Introduction to
Variables

A variable is a container that stores information. Think of it like a box with

a label. The label is the variable's name, and the box holds the data.

Variable Naming
Conventions

Start with a
letter or
underscore

For example: my_variable,

name

Use only letters,
numbers, and
underscores

For example: my_variable_1

Don't use reserved words

For example: if, else, while

Assigning Values to
Variables

We use the equal sign (=) to assign a value to a variable. The variable is on

the left, and the value is on the right.

name = "Alice"

age = 12

Arithmetic
Operations with
Variables

We can use variables in arithmetic operations.

length = 5

width = 3

area = length * width

print(area) # Output: 15

Variable Types:
Integers, Floats,
Strings

Integer

Whole numbers: 1, 2, 3, -5

Float

Decimal numbers: 3.14, 2.5,

-1.2

String

Text: "Hello", "World", "Python"

Exercise: Manipulating Variables

Let's practice using variables. Create a program to store your name and age. Then, calculate how old you will be in 5 years.

go to https://www.online-python.com/ and write your answer.

Variables in Real-World Applications

Games

Variables store player scores, levels, and

health points.

E-commerce

Variables track prices, quantities, and

customer information.

Scientific Research

Variables store experimental data,

measurements, and calculations.

Equation: Area of a Rectangle (length
* width)

1
Step 1

Identify the length and width of the rectangle.

2
Step 2

Multiply the length by the width.

3
Step 3

The result is the area of the rectangle.