python ：九九乘法表

打印9*9乘法表
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
三种方式：
a.for循环

list_i = [1, 2, 3, 4, 5, 6, 7, 8, 9]
for y in list_i:
    for x in list_i:
        print(x, '*', y, '=', x*y, end='\t')
        if x == y:
            break
    print()

b.while循环

x = 1
while x <= 9:
    y = 1
    while y <= x :
        print(y, '*', x, '=', y*x, end='\t')
        y += 1
    x +=1
    print()

c.单层while循环

x = 1
y = 1
while x <+9:
    if x>= y:
        print(x, '*', y, '=', x*y, end='\t')
    y += 1
    if x<y:
        print()
        y = 1
        x += 1