I don't think I understand popen2() behaviour

[Steve Purcell]

Timothy Grant wrote:
> >>> import popen2
> >>> x,y = popen2.popen2('tail -f /var/log/messages')
> >>> tail: /var/log/messages: Permission denied
> tail: no files remaining
> 
> >>>
> 
> Now that was unexpected, as I would have thought that the error messages
> should have been hidden away in my file object y,

popen2 gives you (stdin, stdout) for the child process. You probably want
'popen3' instead if you want to grab stderr.

-Steve

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