while Loops

While loop tab tak chalta rehta hai jab tak uski condition true rehti hai. Iska use tab karo jab aapko pehle se pata na ho ki kitni baar loop karna hai — list par for loop ke ulat, jahan iterations ki number shuru se hi fixed hoti hai.

count = 0
while count < 5:
    print(count)
    count += 1

0
1
2
3
4

Woh count += 1 line important hai — agar bhool gaye to condition kabhi false nahi hoti, aur aapne ek infinite loop likh diya. Hamesha make sure karo ki loop ke andar kuch aisa ho jo condition ko false hone ki taraf le jaaye.

break se jaldi bahar niklna

break turant loop se bahar nikal jaata hai, condition kuch bhi ho. while True likhna common hai (ek loop jo warna kabhi nahi rukta) aur cheezein khatam karne ke liye poori tarah uske andar ek break par depend karna.

count = 0
while True:
    if count == 3:
        break
    print(count)
    count += 1

0
1
2

Notice karo 3 kabhi print nahi hota — break usi moment exit ho jaata hai jab count == 3 true hota hai, us iteration ka print() run hone se pehle.

Aage: functions — code ko repeat karne ke bajaye use naam se call karne layak banana.