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程序如下:

#!/usr/bin/env pythondef showMaxFactor(num):    count = num / 2     while count > 1:        if num % count == 0:            print 'largest factor of %d is %d' % (num, count)            break        #break跳出时会跳出下面的else语句        count -= 1    else:        print num, "is prime"for eachNum in range(10,21):    showMaxFactor(eachNum)

输出如下:

largest factor of 10 is 5

11 is prime largest factor of 12 is 6 13 is prime largest factor of 14 is 7 largest factor of 15 is 5 largest factor of 16 is 8 17 is prime largest factor of 18 is 9 19 is prime largest factor of 20 is 10

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