TypeError: not all arguments converted during string formatting

1、错误描述

>>> a=1;
>>> b=1;
>>> for i in range(1,21):
	print('121d %121d' % (a,b));
	if(i%3==0):
		a=a+b ;
		b=a+b;

		
Traceback (most recent call last):
  File "<pyshell#23>", line 2, in <module>
    print('121d %121d' % (a,b));
TypeError: not all arguments converted during string formatting
>>> 

2、错误原因

      由错误提示可知，并不是所有的参数都可以转换成字符串格式

3、解决办法

>>> a=1;
>>> b=1;
>>> for i in range(1,21):
	print('%12ld %12ld' % (a,b));
	if((i%3)==0):
		print("");
		a=a+b;
		b=a+b;

		
           1            1
           1            1
           1            1

           2            3
           2            3
           2            3

           5            8
           5            8
           5            8

          13           21
          13           21
          13           21

          34           55
          34           55
          34           55

          89          144
          89          144
          89          144

         233          377
         233          377
>>>