Day 2: Variables — Boxes That Remember Things

What's a Variable?

Imagine a box with a label on it. The label says "age" and inside is the number 21. Whenever you need the age, just open the box! That's exactly what a variable is — a labeled box that stores information.

How to Create One

name = "Rohith"
age = 21

name is the box label. "Rohith" is what's inside. Simple!

Real World Connection

When you open Instagram, it shows YOUR name and YOUR followers. How? Variables! username = "your_name", followers = 1500. Every app stores your info in variables.

The Four Types of Boxes

name = "Rohith"       # String  — text
age = 21              # Integer — whole number
rating = 4.8          # Float   — decimal number
is_logged_in = True   # Boolean — yes or no

Variables Can Change!

score = 0
score = score + 10
print(score)

Score starts at 0, then becomes 10. In a game like PUBG, this is how your score goes up when you get a kill!

Common Mistakes

Writing the value on the left side.

21 = age    # WRONG
age = 21    # CORRECT

Forgetting quotes on text.

name = Rohith    # WRONG - Python thinks Rohith is a variable
name = "Rohith"  # CORRECT

Mini Challenge

Quick Quiz

Q: What stores text in Python? A: String — always use quotes!

Q: What does = mean in code? A: Store this value. Not "equals"!

Q: True or False is which data type? A: Boolean!

Key Takeaways