[Python-Dev] optimization required: .format() is much slower than %

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    Nick> $ ./python -m timeit "'' % ()"
    Nick> 1000000 loops, best of 3: 0.389 usec per loop

vs.

    Nick> $ ./python -m timeit "'%s' % 'nothing'"
    Nick> 10000000 loops, best of 3: 0.0736 usec per loop

I think you need to use a tuple for the second case to make it comparable to
the first.

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