## Introduction

Loop else block runs if and only if the loop is exited normally, i.e., without hitting a break.

The following code determines whether a positive integer y is prime by searching for factors greater than 1:

## Demo

y = 13
x = y // 2 # For some y > 1
while x > 1:
if y % x == 0: # Remainder
print(y, 'has factor', x)
break # Skip else
x -= 1 # from w ww. j a v a 2s . c om
else: # Normal exit
print(y, 'is prime')

## Result

The code inserts a break where a factor is found.