[issue4704] Update pybench for python 3.0

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> If possible, pybench should work unchanged in both Python 2.x and 3.x.

Ok, the best I can do is to make it 2.6-compatible. For versions before
2.6, stuff like "except Exception as e" does not make compatibility
reasonably achievable.

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