The Infinite Trap

Hoppy enters a room that locks behind him. A sign says: "Charge the crystal until it is full."

Sometimes you don't know exactly how many steps it will take. You just know you need to keep going while a condition is true.

The While Loop

A while loop is like an if statement that repeats. It keeps running as long as the condition is True.

water_level = 0
while water_level < 3:
  print("Adding water...")
  water_level = water_level + 1

print("Cup is full!")

Your Mission

Empty Crystal

Create a variable energy and set it to 0.

The Loop

Write a while loop that runs as long as energy < 10.

Charge It

Inside the loop, increase energy by 1 (energy = energy + 1).

Status

Inside the loop, print the energy so you can see it rising.

The Infinite Loop

If you forget to increase energy, the condition energy < 10 will ALWAYS be true, and the loop will run FOREVER (or until the Watchdog stops it). This is an Infinite Loop.

Suggested Solution

Click to expand

Charge it up:

energy = 0
while energy < 10:
  energy = energy + 1
  print(energy)

Advanced Tips

Want more? Click to expand

Use for when you know how many times (iterate over a range or list). Use while when you are waiting for a condition to change (like waiting for a user to type "quit").