Best way to capture output from an exec'ed (or such) script?

Cameron Laird claird at
Fri Aug 3 15:48:10 CEST 2007

In article <mailman.1547.1186097565.22759.python-list at>,
Gabriel Genellina <gagsl-py2 at> wrote:
>En Thu, 02 Aug 2007 16:48:06 -0300, <exscape at> escribió:
>> In any case. I've added some minor scripting support, so that you can
>> write dynamic pages in Python. To do this, I use execfile(), and pass
>> the script a dictionary with some basic variables. The script then
>> sets a "ret" variable that's sent back to the browser. That's some
>> major ugliness right there! If I do a "print" inside the script, then
>> it'll end up on the server console. I want it to end up in the web
>> browser.
>If `print` were a function, this would be easy: just provide a replacement  
>into the dictionary you pass to the script. But print is a statement, and  
>this becomes a bit harder.
>If your web server only processes a single request at a time, you can  
>replace sys.stdout (and perhaps sys.stderr) with a suitable object having  
>a write() function: a true open file, or a StringIO instance, or even a  
>custom object that collects "printed" lines into a list.
>If your web server is multithreaded (or you use some other way to process  
>many simultaneous requests) you have to be more careful - remember that  
>sys.stdout is global, you must find a way to distinguish between output  
> from different processes all going into the same collector.
While we're on the subject of Web servers so small
as to be educational, I'll recommend <URL: >.

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