[issue18899] make pystone.py Py3 compatible in benchmark suite

[Antoine Pitrou]

Antoine Pitrou added the comment:

Oh, pystone... I didn't know we had included that particular horror in the benchmark suite :-)

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nosy: +brett.cannon, pitrou
stage:  -> patch review
versions: +3rd party

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18899>
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