方法一：for循环
使用了两重for循环，通过外层循环控制行数，内层循环控制每行的列数，并使用字符串格式化来打印每个乘积的值。
"""
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
"""
for i in range(1, 10):
for j in range(1, i+1):
print('{} * {} = {}'.format(j, i, i*j), end="\t")
print()
方法二：while循环
i = 1
while i < 10:
j = 1
while j <= i:
print(f'{j}*{i}={i*j}', end='\t')
j = j + 1
print()
i = i + 1
方式三：列表推导式
print('\n'.join(['\t'.join([f'{j}x{i}={i * j}' for j in range(1, i + 1)]) for i in range(1, 10)]))
