redirect standard output problem

[iMath]

在 2012年12月21日星期五UTC+8下午3时24分10秒，Chris Angelico写道：
> On Fri, Dec 21, 2012 at 4:23 PM, iMath <redstone-cold at 163.com> wrote:
> 
> > redirect standard output problem
> 
> >
> 
> > why the result only print A but leave out 888 ?
> 
> 
> 
> No idea, because when I paste your code into the Python 3.3
> 
> interpreter or save it to a file and run it, it does exactly what I
> 
> would expect. A and 888 get sent to the screen, B and C go to the
> 
> file.
> 
> 
> 
> What environment are you working in? Python version, operating system,
> 
> any little details that just might help us help you.
> 
> 
> 
> ChrisA


 on WinXP + python32  

when I run it through command line ,it works ok ,but when I run it through IDLE , only print A but leave out 888
so why ?