need help translating a PHP for statement to python

[Dave Benjamin]

In article <mailman.260.1073726548.12720.python-list at python.org>, Eli Pollak wrote:
> Haha ... you must be originally a perl coder. Who else writes attricious
> code like this
>     if ($bar = (($x_ar[$x] -= $prd + $bar) < 0))

I know, I know! C programmers! Right?

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