输出99乘法表(双重for循环)

1 * 1 = 1
1 * 2 = 2 2 * 2 = 4
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81

通过观察99乘法表我们可以看出

当行号为1时输出的内容为

row= 1

1*row

当行号为2时输出的内容为

row= 2

1*row 2*row

所以我们得出这样一个循环

row =7
for item in range(1,row+1):
    print(f"{item}*{row}={item*row}" ,end='\t')

这个时候row 为一个变量，可随意输入一个数字得到该行

我们下面解决row 的循环

for row in range(1,10):    #row循环内容

        for item in range(1,row+1):

                print(f"{item}*{row}={item*row}" ,end='\t')

        print()