While Loops & Loop Control

The While Loop

Imagine you want to keep asking a user for a password until they get it right. You don't know how many tries it will take. This is where a while loop shines: it repeats a block of code as long as a condition remains True.

battery = 100

while battery > 0:
    print(f"Battery at {battery}%. Device is running.")
    battery -= 20  # Drain battery

print("Device shut down.")

Taking Control: Break and Continue

Sometimes you need to interrupt the normal flow of a loop from the inside.

• break: Instantly kills the loop and escapes it entirely, regardless of the condition.
• continue: Skips the rest of the current cycle and jumps immediately back to the top of the loop.

# Infinite loop setup
while True:
    cmd = input("Type 'exit' to quit: ")
    if cmd == 'exit':
        print("Goodbye!")
        break  # Escapes the infinite loop safely
    else:
        print("You typed:", cmd)