【python】九九乘法表三个版本

版本一：

for i in range(1,10):
    for j in range(1,i+1):
        print( '%d X %d = %d' % (j,i,i*j),end = '  ' )
    print('  ')

版本二：

for i in range (1,10):
    for j in range(1,10):
        print('%d X %d = %d' % (j,i,i*j),end = '  ')
        if i==j:
            print('')
            break

版本三：

i = 1
while i <= 9:
    j = 1
    while j <= i:
        print('%d X %d = %d' % (j,i,i*j),end = '  ') 
        j += 1
    print('')
    i += 1