Python Error from Apress book

Gabriel Genellina gagsl-py2 at
Wed Jul 8 00:50:57 CEST 2009

En Tue, 07 Jul 2009 09:55:13 -0300, Dave Angel <davea at> escribió:
> Gabriel Genellina wrote:
>> En Mon, 06 Jul 2009 19:56:40 -0300, matt0177 <matt0177 at>  
>> escribió:

>>> When I try to run the command as outlined in
>>> the book " < test_input.txt > test_output.html i get  
>>> the
>>> following error every time.
>>> IOError: [Errno 9] Bad file descriptor
>> That's a Windows problem. When you execute the script as itself (either  
>> as you do in the command line, or by double-clicking on it), it doesn't  
>> have valid standard handles.
>> You have to invoke Python explicitely:
>> python < test_input.txt > test_output.html
>> (you may need to specify the full path to python.exe, or add the  
>> directory where Python is installed to your system PATH).
> I use stdout this way all the time, with no problem (python 2.6, Windows  
> XP).  But as you point out, stdin redirection doesn't seem to work using  
> the file associations.  I do get a different error though. When I look  
> at sys.stdin, it shows an open file, with handle of zero, as expected.   
> But when I do a raw_input(), it gets:
>      EOFError: EOF when reading a line

I think the error depends on the specific OS version/service pack. But at  
least on XP this appears to fix it:

Gabriel Genellina

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