for n in range(2, 10):
 for x in range(2, n):
 if n % x == 0:
 print(n, 'equals', x, '*', n // x)
 break
 else:
 print(n, 'is a prime number')

(Yes, this is the correct code. Look closely: the else clause belongs to the for loop, not the if statement.)

else 不仅仅可以与 if 连在一起使用,还可以与 for,try,while 使用。