while — Intermediate Examples

Starts a loop that repeats as long as its condition is true

EasyIntermediateAdvancedExpert

While with break and else

Using break to exit early and else for completion.

python
# Search with break
numbers = [4, 7, 2, 9, 1, 5]
target = 9
i = 0
while i < len(numbers):
    if numbers[i] == target:
        print(f"Found {target} at index {i}")
        break
    i += 1
else:
    print(f"{target} not found")

# while-else runs only if loop completed without break
target = 99
i = 0
while i < len(numbers):
    if numbers[i] == target:
        print(f"Found {target}")
        break
    i += 1
else:
    print(f"{target} not found")
Expected Output
Found 9 at index 3
99 not found

The else clause of a while loop runs only if the loop completed normally (without break). This is a clean pattern for search loops.

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