Keep going until you stop
Learn while loops — they keep repeating as long as a condition is true. Perfect for when you do not know how many times to repeat!
A while loop keeps repeating as long as a condition is True. It is like saying "keep doing this WHILE this is still true." The moment the condition becomes False, the loop stops.
💡 Think of it like this:
Think of eating a bowl of cereal. You keep eating WHILE there is still cereal in the bowl. When the bowl is empty, you stop. A while loop works the same way!
While loops are perfect for situations where you do not know how many times to repeat. Keep asking for a password while it is wrong. Keep playing while the player wants to continue.
Where you see this in real life:
An infinite loop is a loop that never stops! It is a common bug — but sometimes it is intentional, like in game engines that keep running until you close the game.
A whileloop keeps repeating as long as a condition is True. The moment the condition becomes False, the loop stops.
We need a counter variable that changes inside the loop. If the condition never becomes False, we get an infinite loop that never stops!
count starts at 1 and goes up by 1 each time. When count hits 6, the loop stops.While loops can count down too! Great for rocket launches 🚀
Click ▶ Run to see the output!If you forget to update the counter, the loop runs forever! This is called an infinite loop. Always make sure the condition can become False.
✅ Safe — counter changes
count = 0 while count < 3: print(count) count += 1
❌ Infinite — no change!
count = 0 while count < 3: print(count) # forgot to change count!
for loop
Use when you know how many times to repeat
Example: Print "Hi" 10 times
while loop
Use when you do not know how many times
Example: Keep asking until password is correct
What happens if you forget to update the counter variable in a while loop?