How to unbuffer Python's output

[Lily Gao]

Hi, All
I am calling a python program in perl and use redirection,
Like :
`python x.py > 1.log 2>&1`
When x.py crash, I get nothing from 1.log, and if I don’t use redirection, I can get useful log from the screen.
How can I do to make x.py ‘s  output un-buffered when redirection log to files ,just exactly same with print to the screen?

When I use perl’s $|=1 to unbuffer output, it take no effect. So I think it may be caused by python.
Thanks!

Thanks,
Lily Gao(高雁)
ACRD PSEB Catapult TD
+86-21-38664379

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