Variables — Value ko Naam Dena -

Intro

Ab tak hum print() se screen par message dikhana seekh chuke hain.
Aaj hum ek aur basic cheez seekhenge: variable.
Variable se coding easy ho jaati hai, kyunki baar-baar number/type nahi likhna padta.

Concept Explanation

WHY (Pehle “kyun”)

Socho aapke paas 3 dabbe hain (containers). Har dabbe par ek label hai.
Aap dabbe me value rakhte ho, nikaalte ho, change karte ho. Python me aise “dabbe” ko variable bolte hain.

Variables useful kyon?

Aaj 600 toys, kal 200 toys… value change hoti rehti hai.
Variable me value store karke hum same calculation ko easily reuse kar sakte hain.

HOW (Ab “kaise”)

1) Variable me value store kaise hoti hai?

Python me value store karne ke liye equal sign = use hota hai.
Example: toys_that_day = 600

Important: Python me variable alag se “declare” nahi karna padta.
Jaise hi aap age = 10 likhte ho, Python automatically memory me ek jagah bana deta hai aur usme 10 store kar deta hai.

2) Variable ki value kaise dekhein?

Value dekhne ke liye print() me variable ka naam likh do:
print(toys_that_day)

3) Variable name kaise likhein? (Rules)

Python confuse na ho, isliye variable naming rules follow karte hain:

Name me letters, numbers, underscore _ aa sakte hain
Space nahi ho sakta, aur special characters (jaise @ # % .) nahi
Number se name start nahi kar sakte
Variables case-sensitive hote hain (name aur Name different)
Underscore use karke words separate kar sakte ho (jaise price_per_toy)

Example

Hum ek variable me number store karenge, phir print karenge.

toys_that_day = 600
print(toys_that_day)

Try It Yourself

IDLE open karo → File → New File
2 variables banao: age aur name
Dono ko print() karo

age = 10
name = "Asha"

print(age)
print(name)

price_per_toy = 35
print(price_per_toy)

Summary (2 lines)

Variable ek container hai jisme hum value store karte hain, aur = se value assign hoti hai.
Variable name me spaces/special characters nahi, aur case-sensitive hota hai.

Next hum dekhenge: string variable (text ko variable me store karna).