python编程实践_字符串

1、输出格式化/多个输出格式化

1 x= 4
2 y= 12.5
3 
4 print \'the rabbit is %d\',x
5 print \'the rabbit is %d years old\',x
6 print \'%f is average\',y
7 print \'%f * %d\' %(y,x)
8 print \'%f * %d is %f\' %(y, x, y*x)

4~6行是输出格式化，7~8行为多个输出格式化

下面是结果

1 the rabbit is %d 4
2 the rabbit is %d years old 4
3 %f is average 12.5
4 12.500000 * 4
5 12.500000 * 4 is 50.000000

然后有两个问题：

1、为什么python中字符串乘负数会为空字符串而不报错？

2、如何输出格式化使%8，打印出0008？