🔄 Loops: for and while

Unit 1 · Think like a programmer · 10 min

A for loop repeats a set number of times: for i in range(3): print(i) prints 0, 1, 2. A while loop repeats as long as its condition is true; make sure it eventually turns false, or you get an infinite loop.

Words in this lesson

• for loop — for loop
• while loop — while loop
• infinite loop — infinite loop

Project: Run a loop on paper: for i in range(1, 6): print(i * i), and write each line of output.