[docs] [issue16950] the old raise syntax is not legal in Python 3

[Tshepang Lekhonkhobe]

Changes by Tshepang Lekhonkhobe <tshepang at gmail.com>:


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keywords: +patch
Added file: http://bugs.python.org/file28713/raise-exception.diff

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<http://bugs.python.org/issue16950>
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