# 9x9乘法表分析for i in range(1, 10):    print("{0} x {1} = {2}".format(i, i, i * i))# 1 1x1=1# 2 1x2=2 2x2=4# 3 1x3=3 2x3=6 3x3=9# axb=a*b# a最小为1，最大为行号# b等于行号for b in range(1, 10):    for a in range(1, b + 1):        print("{0}x{1}={2}".format(a, b, a * b)),        # print("{0}x{1}={2}".format(a, b, a * b),end=" ")        # if a == b:        #     print    print# python2 的不换行print后加，# python3 的不换行加，end=" "