Python 3.0 (aka Python 3000) was released about a week ago.
In the what’s new the python team claim:
The net result of the 3.0 generalizations is that Python 3.0 runs the pystone benchmark around 10% slower than Python 2.5. Most likely the biggest cause is the removal of special-casing for small integers. There’s room for improvement, [...]
Python 3.0 I/O performance issues
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