Beginner · 10 min

While loops

Repeat a block while a condition stays true.

Repeat while a condition holds

A while loop checks its condition before each repetition. Update a value so the condition eventually becomes false; otherwise the loop may never end.

remaining = 3
while remaining > 0:
    print(remaining)
    remaining -= 1

Output

3
2
1

If the condition is false at the start, the body does not run. A line after the loop runs when the loop ends. -= subtracts from the current value.

remaining = 0
while remaining > 0:
    print("Working")
    remaining -= 1
print("Finished")

Output

Finished

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Keep the initial remaining value as 3. Use a while loop to print 3, 2, and 1, then print Go after the loop.

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