如何用while循环 输出一个九九乘法表

方法一

 i = 1
 while i < 10:
     k = 1
     while k <= i:
         print('%d*%d=%2d   '% (i,k,i*k),end='') #end=‘’  表示不换行（系统默认输出完毕换行）
         k += 1
     print()
     i += 1

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

方法二

 a = 9
 while a > 0:
     i = 1
     while i <= a:

         print('%d * %d = %2d  '%(a,i,a*i),end= '')
         i += 1
     print()
     a -= 1

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