python学习笔记：实现简单算法题

两层while循环实现，打印九九乘法表

>>> def minus():
...     x = 0
...     y = 0
...     while(x <= 9):
...             while(y <= 9):
...                     if(y == 4):
...                             print x,"*",y,"=",x*y
...                     else :
...                             print x ,"*",y,"=",x*y,' ',
...                     y = y + 1
...             print 
...             x = x+1
...             y = 0

>>> minus()
0 * 0 = 0   0 * 1 = 0   0 * 2 = 0   0 * 3 = 0   0 * 4 = 0
0 * 5 = 0   0 * 6 = 0   0 * 7 = 0   0 * 8 = 0   0 * 9 = 0  
1 * 0 = 0   1 * 1 = 1   1 * 2 = 2   1 * 3 = 3   1 * 4 = 4
1 * 5 = 5   1 * 6 = 6   1 * 7 = 7   1 * 8 = 8   1 * 9 = 9  
2 * 0 = 0   2 * 1 = 2   2 * 2 = 4   2 * 3 = 6   2 * 4 = 8
2 * 5 = 10   2 * 6 = 12   2 * 7 = 14   2 * 8 = 16   2 * 9 = 18  
3 * 0 = 0   3 * 1 = 3   3 * 2 = 6   3 * 3 = 9   3 * 4 = 12
3 * 5 = 15   3 * 6 = 18   3 * 7 = 21   3 * 8 = 24   3 * 9 = 27  
4 * 0 = 0   4 * 1 = 4   4 * 2 = 8   4 * 3 = 12   4 * 4 = 16
4 * 5 = 20   4 * 6 = 24   4 * 7 = 28   4 * 8 = 32   4 * 9 = 36  
5 * 0 = 0   5 * 1 = 5   5 * 2 = 10   5 * 3 = 15   5 * 4 = 20
5 * 5 = 25   5 * 6 = 30   5 * 7 = 35   5 * 8 = 40   5 * 9 = 45  
6 * 0 = 0   6 * 1 = 6   6 * 2 = 12   6 * 3 = 18   6 * 4 = 24
6 * 5 = 30   6 * 6 = 36   6 * 7 = 42   6 * 8 = 48   6 * 9 = 54  
7 * 0 = 0   7 * 1 = 7   7 * 2 = 14   7 * 3 = 21   7 * 4 = 28
7 * 5 = 35   7 * 6 = 42   7 * 7 = 49   7 * 8 = 56   7 * 9 = 63  
8 * 0 = 0   8 * 1 = 8   8 * 2 = 16   8 * 3 = 24   8 * 4 = 32
8 * 5 = 40   8 * 6 = 48   8 * 7 = 56   8 * 8 = 64   8 * 9 = 72  
9 * 0 = 0   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