python中输出一个九九乘法表

second = 1
while second <= 9:
    first = 1
    while first <= second:
        print("%d * %d =%2d " % (first, second, first * second)),# python2.7版本不换行输出格式，3.0版本为 print("%d * %d =%d " % (first, second, first * second), end=(""))

        first = first + 1 
    print("")
    second += 1